if you have a pile of junker bikes, it's not that difficult to make some that hold 2 bikes apiece. it's been a while, but i'm pretty sure i first saw this design at Derailer in Denver.
i don't have photos of one of these, but it's pretty straightforward and should only take about an hour to build one if you have the parts.
ingredients for one stand:
2 pair of road/drop handlebars, each with a stem.
2 BMX style forks
1 top tube that has the same inner diameter as your bmx fork steer tubes, or close to it.
2 pair of bmx/raised handlebars, each with a stem.
directions:
1. cut the dropouts off one pair of bmx forks so you're left with two exposed tubes.
2. insert a bmx stem in each of these tubes. orient the handlebars so that they're parallel to each other, perpendicular to the fork blades, and at about an 85 degree angle from the fork.
3. take the top tube and slide it over the steer tube of the fork.
4. adjust the bmx bar/stem combo until the top tube is verticle.
this is going to be the base of your stand.
3. repeat step 1 with the other pair of forks.
4. insert the steer tube of this fork into the upright top tube on the base.
4. insert a road stem in each fork blade. orient the handlebars so that each pair is opposite each other, and acts as a pair of hooks to cradle the top tube of a bike.
drill and bolt through the top/steer tubes to connect it all together. cover the drop bars with old inner tubes to pad them so they won't scratch up the bikes being worked on.
it's not adjustable, but it;s fairly simple to make and pretty sturdy. if you're concerned about stability, put something heavy on the bmx bars to keep the thing from toppling.
if anyone's interested and these directions aren't as clear to you as they are in my head, i'm happy to sketch out what it looks like and post a drawing.