Valvoline Instant Oil Change $15 off / 20% off maintainance coupons.
Didn't see this in a search of forums.. I'm still pretty novice, so don't pound me too hard if this is a repost.. Also, this is mainly a slick deal for people who use Valvoline Instant Oil Change, because it's still likely to be nor *super* cheap (depending on what your local place charges).
The website has been taken down, but you can still print from my attached image. Scale so that it almost fills a page in portrait mode. The original was 7.5" wide.
Hope this helps someone. I got it as a customer retention email from a place in IL, but it doesn't say it's for IL only, and actually includes a link to search for stores..