Just a side note, a stroboframe doesn't really cost that much. The cheapest, if I don't remember wrongly is the Quickflip 350, around $130-140. But that is more for SLR/DSLR setups.
Using on your C2100 might look a bit odd.
Think I've seen some Panasonic users had some simple flash bracket to hold the flash, you might want to check along that line.