Verified answer

The Piplup costume is not for sale. It's one that you need to make on your own.

Here's the cheapest Misty cosplay, but you can get a better price if you just bought the materials on your own:

http://www.trustedeal.com/Pokemon-Misty-Cosplay-Co...

This is the cheapest Misty Wig:

http://www.miccostumes.com/product/1121/Pocket_Mon...

normally they're $60

Unfortunatly this was the cheapest I could find for Dawn:

http://www.mooncostumes.com/item/27202

again, you could get a MUCH better price if you made it.

And there is no wig I can find for Dawn.

I cant find any cosplays for May :(

These are the cheapest I could find for Konata:

Cosplay: http://www.399cosplayshop.com/japanese-anime-cospl...

Wig:http://www.cosplay365buy.com/goods-2359-Lucky+Star...

Miyuki:

Cosplay:http://www.399cosplayshop.com/japanese-anime-cospl...

Wig:http://www.miccostumes.com/product/985/Lucky_Star_...

Tsukasa:

Cosplay:http://www.399cosplayshop.com/japanese-anime-cospl...

Wig:http://www.ecrater.com/p/8551158/lucky-star-hiirag...

Kagami:

Cosplay: (Same as the others.)

wig:http://www.fm-anime.com/lucky-star-kagami-hiiragi-...

Based on the size and quality of these Lucky star wigs they are fairly priced.

Hope I Helped! ;D

Maybe you can take a look at cosplayshow.com or milanoo.com ,they are cosplay wholesale shop.You may find all of these cosplays on one site.

i can recommend you a online-sale website , see if you can find these costumes you need

p.s. the costumes on that website are costless, good luck!