I have the thru-hole boards on order now, and the parts are also coming. I'll offer some kits that include the board, parts, and instructions of how to wire and use the buffer. Obviously, they won't be that expensive considering the few parts needed.
I build up a handful of the small SMT versions and realized that was probably going to challenge many folks putting tiny .06" x .03" parts on the a .3" x .4" PCB. The little SOT-23 op-amp is actually easier than the tiny chip parts.