are you looking for 1 plant ---- or a vineyard full? I'd call one of the wineries and ask them - we live in Okanagan - and lots of subdivision type gardens have a few grape vines (tho it certainly attracts the bears, racoons, etc) there are some wineries / vineyards over on the Langley BC side of the river - not sure about the north Fraser side. http://www.hellobc.com/langley/things-to-do/food-wine-relaxation/wineries-wine-tours EDIT to add this old thread link - http://www.botanicalgarden.ubc.ca/forums/showthread.php?t=10534 i agree with the suggestion re: Bylands in West Kelowna - on the flats above the bridge across to main downtown Kelowna. It is pricier according to some - also the art knapps in Penticton has good plant selection - it would be worth phoning and asking if the lower mainland locations can source for you.
