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Most of the DPA programs through the state of CA have been put on hold due to the budget issues but there may still be some out there.
http://www.calhfa.ca.gov/homebuyer/
http://www.nhsie.org/downpaymentassistance.htm
I'm closing on a 114k loan tommorrow in Moreno Valley (moving out of San Bernardino) that is FHA with 6% to closing from the seller so 100k shouldn't be too much trouble