You could always try to grow them from seed. Any sources I've found online say that germination is rare and difficult, but I decided to try anyway. I picked the berries from the shore of Lake Superior in July and saved a bunch of seeds. I sowed some in pots immediately. I cold stratified some for a few months. I direct sowed some outside, which I don't think will be successful. The attached pictures show the ones that were sowed immediately (the bigger plant), and the cold strat ones (little tiny seedlings). I used fox farm Happy Frog potting soil and sprinkled the seeds on top and watered them. It took about a month to germinate each batch. Germination was low, but successful. Oh and to be clear, the species is Vaccinium membranaceum.