you must watch this:
Click to view
Also, I found some one-piece pjs that total $70 after shipping...better than $100, but I think that's about as low as these things are going to get. I can't think of anywhere to find them in regular stores.
http://www.snugasabug.com/ Maybe it's time to think of a cheaper costume. Although, I suppose I could just go the gray sweatpants/sweatshirt route. Not as fun, though.