Galapagos Market on Hennepin in Northeast Minneapolis (kind of across from Aveda) is a small Ecuadoran grocery that used to carry it in the freezer case. I've not been there in a long time, so I'm not sure if they still do, but if they don't have any in stock, they'd probably know who does. There are also a couple of Ecuadoran markets in the area of Central Ave and Lowry. You might have some luck at those. There is also an Ecuadoran Church in that area that serves it on occasion.