Always hard for me to find 96/4 lead free solder.

Using Arduino General Electronics
2

You can get 1lb. for $98 and it's a well-known brand:

http://www.techni-tool.com/488CH7402

Frankly, I'm a fan of Kester's K100 -- much cheaper too:

http://www.techni-tool.com/488SO1331

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The Ruggeduino: compatible with Arduino UNO, 24V operation, all I/O's fused and protected