This forum isn't intended for buying/selling Halo armor, it's here to let people document their hard work and get advice from others. I'd recommend slowly saving money for supplies and working on it yourself. To build armor out of foam all you really need is foam, a glue gun, and an hobby knife. Foam is about $20 for 4 mats at my local hardware store. And depending on where you shop you could probably get knife and a glue gun for about $5 each. Besides, making it yourself is fun and you can look at it with a smile and think 'Damn, I made that!". And just like Colbs said, compared to how much custom suits sell for, making one yourself is cheap.
-Ryan M-082