I just built some boxes out of plywood and put my existing desk on them. It was still a bit too low (my back was hurting) so I added a 2x4 on each side between

I just built some boxes out of plywood and put my existing desk on them. It was still a bit too low (my back was hurting) so I added a 2x4 on each side between the box and the desk leg until my back stopped hurting. Works great and very inexpensive!