I just bought another set of cans on Amazon, and have been seeing their prices go both up and down, on the same cans, almost daily(!) -- I have been watching every day this past week, and the can of my choice was down, then way up, then down 2 more increments, then down enough today to push my *buy* button. I bet tomorrow they are back up again, but I already got my good price, so it doesn't matter where the price goes now -- I am happy with what I paid.
They might be playing with prices for some market research.
If you are a fence-sitter on one of the cans that has a currently-low price, then go for it!
I did.
