New lower price for Axon II ($78) and Axon Mote ($58).
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Maybe you want something like this: http://www.dimensionengineering.com/Sabertooth2X25.htm, it is expensive, but if you make one yourself it might cost just as much to get it not to melt.
I guess that most of us tend to think positive. As a result we under-engineer our own designs. So the problems with MOSFETs or diodes is not a problem with their construction - we've just specified a 'kid' to do a 'man's job - to keep costs down. The result is that they've blown.Some folk end up deciding that it actually ends up cheaper buying a pre-built one.Of course you can build your own h-bridge if you want. But beware of any 'peak' requirements - so 'over spec' your components if in doubt.
Also, the two top MOSFETs should be PNP, and the two bottom ones NPN.