[luxpir]

If you're asking for sit/stand, not necessarily adjustable, grab one of these:

http://www.ikea.com/us/en/catalog/products/90087541/

And pair it with a bar stool. I've done just that and it's got me standing more often than the 5x more expensive adjustable solution would have done. That's assuming the default position for the adjustable would have been down. Which it would have been for me. It's sturdy, compact and tidy when coupled with the under-desk cable-tidy (just fits diagonally).

I've lost the comfort factor of the big chair and desk, but I've gained a more active default position. It's also easier to wham the treadmill under the desk when I'm feeling lively.

Folks, I do try not to be a tragic startup cliché.