I took my Vikings in to Vegas and was charged $75 each just for a cleaning and checkup. It was suggested I bring them in once a year, if I use them a lot. Took one of them to another dealer, in another state, three months later for a 'problem' and was charged $60 for cleaning, after I told him NOT to clean it (he really didn't clean it because I found a ton of lint in it when I got it back :x ). I've had my Featherweight cleaned for $25 close to home. It all depends on the type of machine and where you take it. Make sure you clean out the lint at LEAST after every project. :roll:
Chris