"Silage Corn" runs about $45.00- 50.00/bag (80,000 seeds). I've used that with good results.

A farmer friend told me to ask for "Floor Corn" wich is bagged up off the floor of a grainery - it often has mixed seeds (85 days, 95 days, 110 days - etc) - which for deer WHO CARES - its probably better since we leave it. Supposedly its REAL CHEAP - but so far, my source have never had it available.