[kourt]

Common cinder blocks / gray blocks measure 16" x 8" x 8" and cost about $1.30. I stack two in order to get 16" of lift and place a stack under each corner of a traditional flat desk. I actually have two desks, one for keyboards and another for monitors, so I needed 8 stacks, but you get the idea. It provides a huge, stable flat work surface for $10.40 per desk.

If you are shorter, half-height blocks are available to get to 12" of lift, or if your are even shorter, just use one layer and get 8".

I also bought a 29" wooden bar stool at Wal-Mart for $20 to take brief breaks for standing.