The same thing from ebay for $1.60 US free shipping (but a long wait 
) and without the fancy case:
Bought a couple for when I don't need much current at 12V. When I do, 2 boost regulators for a couple of bucks more each will give you up to a couple of amps at +-12 at the cost of much more current from the 5V supply. +12 is obvious, for -12, ground on the boost reg goes to +5V positive input pin goes to ground (giving the -12V boost 5V input and the output needs to produce 17 V to produce -12 V relative to ground (and obviously needs a well regulated +5 supply as well). I'll eventually probably make a part for these as well. However the more parts the better .
(edit) It is worth pointing out, the the ground (both input and output) on the -12V boost module is in fact +5V not ground. It is therefore unwise to either use it as a ground or connect it to ground (a release of the magic smoke, followed by non function is in fact possible if you should do so)
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Peter Van Epp