Hmm, I'm having a hugely difficult time finding any suitable through-hole LED drivers here. Went to DigiKey, Mouser, even Element14, Newark, Arrow, and a few others, but no dice on any of them. The closest I could find was a DigiKey unit that has a minimum order quantity of 1,000 -- far too large for a project this small. Might have to hand-solder an SMD one, which could prove difficult. What kind of SMD footprints are the easiest to hand-solder?