MT3608/SX1308 boost converter and others

My favorite buck-boost modules are the LTC3780 modules available on ebay and elsewhere. Good current capability and lots of flexibility. They are quite a bit more expensive though, and larger. Depends on what you need for the application at hand.

http://m.ebay.com/itm/LTC3780-Automatic-lifting-pressure-Constant-voltage-step-up-step-down-10A-130W-/111557983282