I have a small armoire computer desk that I have used in the past, depending on how much space I have to work with. My machine sits inside where a monitor should go. It has small shelves and a big file drawer below plus other space to stack fabrics etc. in. You pull the machine out easily and place it on the full width keyboard when sewing. At the end of the day, just slide it back into the cabinet and close the door. It works well if you have it in a room that you don't really want your sewing stuff to be out front and center in. Mine was under $200 at Walmart. Sauder Co. I believe. I've had it for about seven years now, moved it several times and it's still very sturdy.
http://www.walmart.com/search/search...e&_tt=computer