I see Optimus Prime costumes but why don't they make Megatron costumes?

They actually did make Megatron costumes, but I've only found them for sale from UK websites and overseas sellers on eBay. They're not much more expensive than buying locally, and if you buy now it'll arrive in time for Halloween.

Transformers Optimus Prime Costume "Transforming Into Prime"

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

Optimus Prime Play Costume Size M NEW US $12.99

OPTIMUS PRIME TRANSFORMERS CHILD COSTUME LARGE 10 12 US $21.95

OPTIMUS PRIME TRANSFORMERS CHILD COSTUME MEDIUM M 7 8 US $28.99

Transformers DX Optimus Prime Costume New Size 10 12 US $79.99

NWT Halloween TRANSFORMERS OPTIMUS Prime Deluxe Muscle Chest Boys Costume S 4 6X US $26.99

NWT Halloween TRANSFORMERS OPTIMUS Prime Dlx Muscle Chest Boys Costume H 10 12 US $26.99

Boys Transformer OPTIMUS PRIME Costume MEDIUM NEW IN BOX US $13.99

Transformers OPTIMUS PRIME Muscle Reflective Halloween Costume H 10 1 2 12 1 2 US $22.41

Transformers Revenge of Fallen Optimus Prime costume M US $12.49

Optimus prime halloween costume REDUCED US $8.00

Child Toddler DLX Costume Transformers Optimus Prime US $31.99

Costumes Lic Hasbro Optimus Prime Transformer Costume US $49.99

OPTIMUS PRIME Boy Costume Transformer Classic 10 12 Lg US $29.95

NEW HARD TO FIND OPTIMUS PRIME TRANSFORMERS COSTUME 7 8 US $29.99

TRANSFORMERS ANIMATED OPTIMUS PRIME COSTUME SMALL 4 6 US $20.99

Transformers Optimus Prime Child Costume M 7 8 US $22.99

NWT Transformers OPTIMUS PRIME Boy Costume sz 10 12 Muscled US $19.49

Halloween Transformers OPTIMUS PRIME Costume SZ 3 4T US $11.99

Girls Transformers Optimus Prime Kids Halloween Costume US $27.49

Mens Transformers Optimus Prime T Shirt Mask Costume US $32.49

Deluxe Optimus Prime Transformers Men Halloween Costume US $47.49

Halloween Party Transformers OPTIMUS PRIME Costume 2T 7 US $11.99

12 18 months Baby Optimus Prime Costume Transformers US $11.55

Toddler Kids and Toddler Muscle Optimus Prime Costume US $22.00

TRANSFORMERS Animated OPTIMUS PRIME CHILD COSTUME 7 8 US $22.39

Brand New Transformers OPTIMUS PRIME Halloween Dress up Costume HUSKY 10 12 US $11.98

TRANSFORMERS OPTIMUS PRIME HALLOWEEN COSTUME 4 6 BOYS US $24.99

NEW Transformer Optimus Prime 3D Deluxe Child Boys Medium 7 8 Halloween Costume US $72.99

Transformers Optimus Prime Costume Halloween 7 8 NEW US $14.99

NWT Boy Costume Transformers Optimus Prime Lic 10 12 US $44.99

Brand NEW Transformers Optimus Prime DELUXE Costume M Size 7 8 Revenge Fallen US $30.00

Child Boys Transformers Deluxe Optimus Prime Costume Size Small 4 6 US $41.39

Child Boys Transformers Deluxe Optimus Prime Costume Size Medium 7 8 US $41.39

Child Boys Transformers Optimus Prime Costume Size Small 4 6 Halloween US $27.59

Transformers Optimus Prime Muscle Costume w Headpiece Toddler 2T New US $25.19

Transformers Optimus Prime Muscle Costume w Headpiece Child 4 6 New US $23.59

TRANSFORMERS OPTIMUS PRIME HALLOWEEN COSTUME SZ 4 6X US $15.99

TRANSFORMERS Optimus Prime Dress Up Costume Boys Size L 10 12 Halloween NEW NIB US $19.99

Disguise OPTIMUS PRIME Transformers Halloween Costume Child 4 6 S NEW US $19.99

Transformers Optimus Prime Halloween Costume Dress Up Boys Size M 7 8 NEW NIP US $19.99

TRANSFORMERS OPTIMUS PRIME AUTOBOTS SUPER DELUXE ADULT HALLOWEEN COSTUME NEW US $94.99

NEW TRANSFORMERS OPTIMUS PRIME COSTUME HELMET SIZE 7 8 MEDIUM CHILDS BLU DOTM US $19.99

Transformers Optimus Prime Boys Costume Husky Size 10½ to 12½ US $19.99

NEW TRANSFORMERS OPTIMUS PRIME COSTUME Sz Boys S 4 6X Halloween US $18.00

NEW TRANSFORMERS OPTIMUS PRIME COSTUME Sz Boys L 10 12 Halloween US $18.00

Transformers Optimus Prime Halloween Costume Child Size Medium 7 8 US $15.98

Transformers Optimus Prime Costume for Boys US $22.96

Child Transformers Optimus Prime Deluxe Costume US $36.96

View Page:   1  2

By Relevance Bestselling Price: low to high Price: high to low Newest arrivals On sale

Optimus Prime Classic Muscle Costume List Price: $42.60

Deluxe Optimus Prime Transformers Kids Costume List Price: $59.99

Optimus Prime Movie Classic Costume List Price: $39.99

Adults' Transfomer Optimus Prime Costume (X-Large) Sale Price: $25.00   Eligible for free shipping! Availability: Usually ships in 1-2 business days

Optimus Prime Movie 3-D Deluxe Child Costume List Price: $65.00

Child Optimus Prime Gloves

Optimus Toddler Muscle Costume List Price: $61.32

Child Optimus Prime Deluxe Transformers Costume List Price: $55.99

Disguise 19238DI Optimus Prime Sword Sale Price: $10.98   Eligible for free shipping! Availability: Usually ships in 1-2 business days

Transformers: Dark of the Moon - Robo Power - Costume Optimus Prime (Medium) List Price: $22.99 Sale Price: $14.50   Eligible for free shipping! Availability: Usually ships in 1-2 business days