Mine came from the Swag store, but without a GPIO extension header. That would have been nice. Not strictly necessary. Just nice. And I don't need 12 screws. 8 will be fine.
I can't imagine being a happy camper without stand-offs though. Nobody likes their board flapping about. You really need *at least* 2 stand-offs and 4 screws. On every HAT.
Microcontroller addon boards and software for Raspberry Pi A+/B+/Pi2:
- ARMinARM: ARM Cortex-M3 (STM32)
- AVRPi: ATmega32U4 & ATmega328 ("Arduino")