Adafruit Industries TPS62827 3.3V Buck Converter Breakout - 3.3V Output 2 Amp Max - Micro Center
VERTER 5V USB Buck-Boost - 500mA from 3V-5V / 1000ma from 5V-12V : Office Products - Amazon.com
UBEC DC/DC Step-Down (Buck) Converter - 5V @ 3A output : ID 1385 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
VERTER 5V USB Buck-Boost - 500mA from 3V-5V / 1000ma from 5V-12V [TPS63060] : ID 2190 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
LM3671 3.3V Buck Converter Breakout - 3.3V Output 600mA Max
Adafruit Industries PowerBoost 1000 Basic 5V USB Boost @ 1000mA from 1.8V+ - Micro Center
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Adafruit VERTER 5V USB Buck-Boost - 500mA from 3V-5V / 1000ma from 5V-
VERTER 5V USB Buck-Boost - 500mA from 3V-5V / 1000ma from 5V-12V [TPS63060] : ID 2190 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
DC Buck-Boost VERTER 5V USB 500mA from 3V-5V 1000ma from 5V-12V Philippines | Circuitrocks – circuitrocks
Adafruit VERTER 5V USB Buck-Boost - 500mA from 3V- 5V / 1000ma from 5V-12V - Walmart.com