I bought a couple of esp-12 modules with breakout board from ebay recently.

These modules have the same pinout at the esp-07 but have PCB antenna instead of the chip antenna.

The breakout boards work, but they have a couple of problems:

• No pinouts for decoupling caps for the LDO
• They are wide! Which means that they will fit on a standard breadboard, but they cover all the holes.