I guess they were available at menards for 5$ at one point but it seems lots of people are pretty happy with them at all sorts of prices one guy says he bougt 15 of them at 5$ so a couple bucks more is probably reasonable too considering you don't have to start the car or pay sales tax .
Do you know if they ship worldwide? Can't find any shipping info on the page (besides "plus one penny shipping") and would like to know before I register.