All you need is a mirror on a stand and a wash basin or bowl. You can get both at Walmart for under $10. I use my picnic table on the patio and sit while I shave. Works great.
It's funny I'm switching to straights and have just started looking for one. I'm not sure if I'll go with a dedicated one like this or just get a small stand, mirror and bowl. Either way, it seems like a cool idea.