I got the plant at Annie's Annuals and Perennials in Richmond, CA. I think there may have been one or two more, but you really have to dig in the back under the benches to find them. When I bought it, the employee was not aware it was being sold. It was $19.95 in a 1 gallon pot. The pot was severely distorted by the tubers.

My initial hope was to remove the growth on the left with a bit of tuber, and also separate the small almost spherical tuber at about 2 o'clock (this also has a tiny shoot). My original plan was to replant the other big shoot and the bulk of the tubers into a big pot...

Here are a few views of the plant once I cut the pot away:

Unfortunately the pieces did not break apart as I planned. Here's what I got:

The pieces numbered 1,7 and 8 all have tubers plus shoots, as does the small tuber number 5. The separated new growth (number 2) has roots, so hopefully all 5 of those will make it.

I doubt the shoot fragments (3,4,6) will survive, but I'm willing to be surprised...

It will be interesting to see whether the tubers without obvious growth (numbers 9 and 10) will send out shoots. If so I could get as many as 7 plants out of this.

These guys look like they would like more sun, and I'm in the process of relocating them. It's really hard to believe that all of that fit in a 1 gallon pot (the pot in the upper right is 1 gallon, for comparison).