usually I check out the larger supermarkets and chemists, and places like big W and Kmart are also quite good, I live in a semi rural area and our local supermarket will hcarge anywhere from $5-$10 more than what some of the larger stores will charge so its deffinately worth a look around, I guess the best thing to do is keep your eyes open for any specials etc and if you do see a good one grab a few tins to last a month or so so that by the next time you are out looking for it it may well be time for it to go on sale again kwim?