[GTALUG] Where to buy Raspberry Pi

I just found out my Raspberry Pi B+ (model 1) can't do USB device mode. Its microUSB port is power only.  According to official specs, Raspberry Zero W (model 1 or 2) do support "OTG" on its microUSB port. So, can anyone recommend store selling Raspberry Zero W? Even Amazon sell it, but I'd like try local store first.