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SparkFun is one of the largest online stores that offer custom electronic accessories for all sorts of embedded applications. There, you'll be able to find development boards from pretty much all the major manufacturers, including Arduino and RaspberryPi alongside with some specific breakout boards that range from simple keyboards all the way up to custom STM32 embedded development platforms. See More
You'll not have to spend time looking for the datasheets of the individual products since Adarfuit provides full documentation of almost every electronic accessory they sell. In the majority of cases, they even offer product-related Arduino and RaspberryPi libraries as well as some schematics and Gerber files. See More