GRIN is a USDA project to ensure genetically diverse specimens are available to researchers. Apples, pears, grapes, cherries, oats, wheat, ornamental plants, native species. Wide variety available for free. For apples, you can get scionwood for spring grafting, bud wood for summer grafting, and seeds from the wild apple trees they brought back from expeditions to Kazakhstan. For grafting apples, they prefer you get the common varieties from other sources.