This repo contains, the "Hardware" files to support STM32 based boards on Arduino version 1.5.x to the latest version (currently 1.6.3) including LeafLabs Maple, and Maple mini, and other generic STM32F103 boards
[Ebay search for "arduino maple"](http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&LH_BIN=1&_nkw=arduino+maple&_sop=15) (currently costs <$5 with shipping)