Hi ja221 -- I recommended GreenCheeze.com to one of my clients and we hired them for a July 17 event...we have yet to see but so far, the owner, Jaimee, has been really responsive and great to work with. We opted to use our own collection of
props instead of paying $100 to own them.
Another option is to ask if your photographer has ever setup a photobooth for clients (many are adding to their packages) and you can DIY the background and collect props from friends and buy cheap stuff from the East Bay Depot for Creative
Reuse (lots of awesome stuff).