Unfortunately the one in Grand Mound, Wa. doesn't seem to offer the same types of codes you see somewhere like Sandusky and I would guess that would be because there is no competion here in Wa. and in Sandusky they have an indoor waterpark around every corner. The best thing to do here is check the website daily, I was able to lower my rates $30 about 2 weeks before I went in July. They also put up codes on local TV in Seattle, not sure if they do that in Portland or not but most of them seem to be for 2 nights but after school starts they should start to offer more. Good Luck!