Foreclosures hit the market in the same way other properties do. They will be found on your local MLS. Ask a local Realtor to set you up on search for your desired criteria. You will also find listings on sites such as Trulia. However, be aware of pre-foreclosures, which are not on the market yet. If the price sounds too good to be true, it may be a defaulted amount, not the sales price. You should also never need to pay a service to get foreclosure listings.
Read more about foreclosures here: http://richardschulman.com/buyers/foreclosures/
Good luck in your home search!
Keller Williams Realty