Have bunches of chickasaw plum seeds from local bushes. Not a bad fruit quality as is but makes a great rootstock for other prunus species. 5 seeds for $3 plus shipping usps first class package.
Earlier this year I grafted aprium, pluot, and improved plums to my established trees in my yard with success. Hear nectarines and peaches graft well to them too.
Hit me up! DG