Depending on where you live you may be able to get a Saskatoon bush for free! They sucker quite a bit and if you know someone who has one or if there are wild ones in your area you can probably just go dig a baby one up.
I dug up wild suckers a few times and transplanted them and they always seem to live. One of them I gave to my mother years ago and it produces well.
That would be an interested ad to post on the local facebook yard sale sites..."ISO saskatoon suckers!" :)
:D That would be rather comical.