J. L. Hudson, Seedsman has Zizyphus, Jujube listed in their print catalog in 2013 and 2014 but it isn't listed in their online catalog. They will be closed for the month of September so you'll need to order quickly. You should be able to follow thier online ordering instructions and use Description: "JUJUBE', 'CHINESE DATE', 'DA-ZAO' ID: ZIZI-1 Quantity: 1 Price: $3.00
Request the print catalog which will have the germination instructions. 10 seeds for 3 bucks plus $2.50 for postage seems quite reasonable. The catalog says they are hardy to zone 5 with protection ( although I don't know how you protect a 20' - 50' tree) Claud
Note: I've ordered from them several times over the years and have always been happy with the transaction.
http://jlhudsonseeds.net/
