I bought two of these and a table top from Ikea. The legs are adjustable for height and each have a shelf. The top has holes in it so it is just laying on the legs and can be stored away if you need to. Pegs in the legs keep the top from sliding around. If you buy a $20.00 top, with shipping it should only cost about $100-$120.
http://www.ikea.com/us/en/catalog/products/00144763/