Hackspace is a local geek club for playing with electronics and computers. Ok, could I get more condescending? Hey, I’m a linux / microprocessor geek myself. Anyway, a local club develops with a facility and tools that are shared with members, and there are usually official hack nights, as well as drop by and work times. Bulk buys are usually available, and members share skills and ideas. Check one out near you, or start one yourself.
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http://strugglers.net/~andy/blog/2010/08/30/london-hackspaces-arduino-for-beginners-workshop/
http://www.heatsynclabs.org/this-week-arduino-night-and-take-apart-night/