It's strange, some parts of the country have really good retail infrastructure for plotters (seed by the lb, bagged fertilizer, willingness to order). I'm in the heart of farm country out here, and you damn near get punched in the face when you inquire about food plot quantities.
Green Cover is really close to having everything. There's only a couple more things I wish they carried. If they could get that figured out, I'd pay the pallet rate to get it all in one shot. I got my hands on some of their forage corn a few years back and had a guy plant some. It came very well, and for what it was, it was a great value. It's not 350 bushels and 10' tall, but it put on nice cobs and early enough to overseed in fall.