I'm really not trying to be mean, but imagine your ancestors for a second. You know, the guys who ran down and killed animals that weighed several tons. Imagine how befuddled they'd be, sweating and bloodied from defeating the mastodon that just tried to kill them, when you told them that you can't be bothered to stand up for a little while while you type. It says something pretty embarrassing about society when we've collectively decided that myriad orthopedic problems are better than standing up.
That rant over with (sorry, again), I just went to the local hardware store and got some cinder blocks. The price difference (~$7 for the cinder blocks versus ~$1000 for a height-adjustable desk frame) was worth the slight lack of convenience. That, and without the adjustability, I won't be tempted to just leave the desk in the 'down' position.