I had a guy come out to my place and do the winterization / shrink wrap thing last year. I think all in it was about $200 and I have a 17' bass tracker. If you use the big shops they tend to charge silly prices like when you take your car to a "dealer"
I hear North Erie Marina has a mechanic on site and they do the wrap / winterization thing too. I seem to recall they were reasonable on their price per ft. I will say, I have never had an issue even with all the snow we had last year and stored outside, worth it not to have to go "play in the snow".