SWF, BGT, and Disney don't really do coupons anymore. SWF used to do things with Pepsi 2 liter bottles, but that was 2 years ago. Recently, I think (IMHO), they've gone the Disney route and stopped doing coupons. Instead, you're supposed to buy multi day tickets or a flex pass to get a discount.
The discounts are on the web site with multiple park/day tickets.
Once you become an AP (Annual Passholder) then you get a huge discount, along with snail mail offers.
SWF is worth it, and the coupon is only a few dollars off. I wouldn't worry about the coupons, instead, plan a good trip visiting the parks you want and enjoy.
You'll save more money with buying a cooler, stocking up at a grocery store, and eating grocery food, instead of a restaurant.
I realize that some of you will only come down here once a year. If this is true, then you save your money by renting a car, and eating grocery store food, instead of eating out.