Well, dropped by the Fill-n-go on edmonton trail. Traded my expired 30 lb tank for a recertfied one (July 2016 date). Total cost for tank and fill was $52.45. I don't think I'm going to do much better than that.
While I was chatting with the guy, he did mention that they often run out of recertfied 30 lb tanks. I guess not that many people trade them in? They have tons of the 20 lb tanks though.
With how little propane I use, and the little bit left in my other expired tank, I should get through the rest of the summer.