Costume Castle or Costume express
You can find a good hippie costume at costume express. They carry a bunch of different costumes and they are just a costume store so they would be the best place to look for your hippie costume.
Any local costume store should have exactly what you're looking for since it is a popular choice for Halloween, but a much cheaper alternative to a costume store is your local department store, they should have what you need.
Wal-mart, the costume store, Target
An adult Superman belt can be bought in just about any costume store or simply on Amazon. A good place would be to search on costumecraze, an online costume store.
You can find a mator costume in many stores. Examples would be Walmart or your local Halloween store. A good place to get prices is from Walmart for a mator costume.
The best place to find a good Minnie Mouse costume is at the Disney Store. Disney Stores are located in major shopping malls throughout the United States. You may also get a good deal on a Minnie Mouse costume on eBay.
To find good costume wigs, I highly recommend going to a costume store. I'm unsure of your location, but many places have stores set up only for fall where they sell costume wigs. A good place on the west coast would be Costume Castle, but any stores such as Wal Mart or K Mart may have a decent selection.
The costume is free to download from the Playstation Store
You get the key for Good Deals when you surprise the robber at MacGuffin's. (He knocks you down at the Costume store.)
Costume express is a costume store that offers an assortment of costumes. Here is the website:www.costumeexpress.com
in the store
You can buy a skull bag costume from your local Halloween store. Depending on your area the prices can vary. Hope you have a very good Halloween!!!!!!