Sign up for every free customer rewards program you can. Even if you rarely shop at that place, having a rewards card for that place will eventually net you some coupons and discounts. Here’s the basic game plan for maximizing these programs: create a Gmail address just for these mailings, collect every card you can, and then check that account for extra coupons whenever you’re ready to shop. Many rewards programs mail out great coupons via email that can really save some cash.
If you’re cautious about giving out other personal information, make it up. This might violate the rules of the program, but in most cases, the program’s benefits are “virtual,” meaning they don’t require direct contact with your identity.