We are out in California, and built or bought all our own props for the show. I don't think we even kept the stuff after the show. None of it was expensive or hard to make. The other major choreo props were as follows:
The corrugated tin sheets that they slide across in IGR - The raw material for these is available at any Home Depot, and is inexpensive. We mounted ours to sheets of plywood to make them more stable, and to make them easier to handle (no sharp edges this way).
Washboards for IGR - Got these from a thrift store.
Other misc. percussion instruments for IGR - You can really use anything. We used old garden tools mostly.
Strings for Slap that Bass. - We sliced up rope, then tied it together with thread and put it on a reel that we made.