join the National wild turkey federation, they have spring buys on left over seeds, you can get round up[ ready corn, and soybeans and other seeds(300-400 bucks a bag seeds) for like 35-45 bucks a bag, pending the area your in
costs 25 bucks to become a member for the yr?
you have to contact your local TWTF, and do so SOON< they take orders based on first come first service and it all comes down to what is offered in your area
its the CHEAPEST way I know of to get seeds, deal is, it HAS to be for wildlife Only you cannot harvest it
and second its a YR old seed, I have used the seeds for 15+ yrs and NEVER had any NOT grow, if I did my part(fertilizer and soil PH) and weather worked(rain and sun)
I always add extra inoculate , its IMO cheap insurance to help boost growth, any AGWAY or like store can sell you some cheap to treat seeds before planting
other wise, I know of no other main stream way of getting Good seed cheaper
and joining the NWTF is also going to send money to a good cause as well,
so a win win!