I got a simple lightweight prop, the sort my lbs uses. Another poster made a link:
http://www.wiggle.co.uk/pro-bike-display-stand/Just a folded over piece of metal with two prongs for the back where axle.In fact, we got three, one for all the bikes. Light, portable, and hold the bike up just fine. I was amazed at how effective they are for something so small and light. We'd gone through all sorts of storage possibilities and they all cost a lot, were awkward, and would have got seriously in the way if we'd needed the space for doing anything else.
You can screw them down to the floor if you want to, but they don't need to be, we don't bother doing it with ours and the bikes live on them all the time.
We put three bikes on them side by side and the centre bike's front wheel runs up a channel (plastic piping) to keep its bars above the others' so they can be closer together to save space.
The stand is sturdy enough to load my panniers/rackpack, lubricate the bike, do the tyre pressures, or even be used outside when cleaning the bike when it's filthy with mud, though I wouldn't do serious repair work on it. Takes bikes with mudguards no problem.