Good, budget backdrops?

I am wanting to build a makeshift "studio" in my room, mainly just to play around with portrait photography. I want a white backdrop and a black backdrop, where would be a good place to get them for under $100? I have also heard of using queen bed sheets, would that work?

fabric stores. you can find it cheaper and more options.

www.amvona.com

I got a muslin from Kaiser before. It's cheap but quality is way better than bed sheets for sure.

http://www.muslinphoto​.com/pure/index.html

The main thing is, I want that paper look, but with the reusability of fabric.

I'm temporarily using a bed sheet. It looks fine but sometimes you see ripples in the fabric.