I know it's rare for these to be on sale but it seams xbox points cards are on sale from time to time but I never see PSN cards on sale. Any sales going on or that I should be on the lookout for?
The only way you're going to get a discount on these is to use something like earned reward points (at Best Buy for example) or with a vague coupon. They've only been on sale one time and even that was YMMV.