Its like $1800 for one of those decent MEMS thingys.

I think your better off building your own
till the price comes down.

http://avnetexpress.avnet.com/store/em/EMController?langId=-1&storeId=500201&catalogId=500201&term=SF3000L%2Baccelerometer&N=0&action=products&x=8&y=11 

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