See this Link at Figs 4 Fun. It has links to the various varieties, to the USDA site, to ordering page, etc.
Everything is here, on the USDA page
Deadline USED to be Dec 1. NOW it is November 1.
You USED to order on a paper form. NOW it is done on line.
You DO need a UPS or FedEx account to cover shipping. Specify Ground shipping, which is cheaper. Their default is Overnight shipping which is more expensive.