Catherine,
You don't have to spend a fortune to get a workable table -- that even gets your sewing bed flush with the table surface!
I recently bought a Roberts 299 portable sewing table [
http://www.sewingtableshop.com/sewin...le.cfm#details] and it works great. I needed something that would fold up and that didn't cost a bundle. This one fit the bill perfectly.
Check around; you might even get a better price than this...