Cheap recommendations? Hmmm, I found my Horn of America cutting table for $75 at a moving sale, I stole that one! If you really want to watch costs, I would recommend Craigs List, or looking on line. I have bought really nice sewing furniture that way, I can't afford the prices that they are asking for on quality furniture.
However, as a good husband, perhaps you could make her one. Look up DIY sewing tables, and see what you come up with. I have had several friends do that and they had made some amazing sewing furniture for minimal cost. Remember happy wife, happy life
sewguide.com/diy-sewing-table/