What stage is the foreclosure? Is it going to sheriffs sale or has it already been foreclosed on?
If it's coming up for sheriffs sale, then you can put in a bid on the sale date. Offers on sheriffs sales need to be the highest and many times are cash only.
If the bank has already foreclosed and the property is listed for sale, then you can make an offer on it. Keep in mind that the banks are looking for the best and highest offers. You can put down what ever amount you want, but the higher the better.