Resources for self-testing practice tests

Hey developers

Does anyone have recommendations for self-testing resources?

I’ve used uCertify in the past, but they seem to have fallen behind as far as Microsoft technologies go.

Official Microsoft practice tests (such as[url] http://www.mindhub.com/productdetails.asp?ProductCode=MU-70-483_P[/url] ) are a bit expensive.

Does anyone know of less pricey, or free, equivalents?