Eventually I'd like to get something like that, but what works pretty darn well for most repairs where the bike needs to be off the ground is either:
1. Putting it on my bike rack, strapping it down if need be to stay in place.
2. Flipping it upside down, putting one sawhorse underneath handlebars, one underneath the seat. Or just do this on the ground, putting a towel down under each to avoid unnecessary scratching/scuffing from contact with concrete.