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If you're not concerned about containing a large percentage of particulate coming off of your printer, you can opt for my low cost enclosure solution.

The curtain enclosure: The curtains each measure 28" x 15.5" and are cut from pleather that I had hanging around the house. I would guess that most fabric you have hanging around would work similarly enough.
The fabric is inserted in the small clamp on the back of the curtain clip and the clip is simply slid on the plate at the edge of the build area.
Here's the clip model:

I like it! It's a lot cleaner than my canvas-and-binder-clips version.

g.