I think the advice point is, in part, also met by the Internet. I caveat with the line that not all people use the web but for me, and a lot of other people, my first thought if I have a modelling query is to post a question here and often get best in class advice from the users here.
Certainly the immediacy and interaction on Tony Wright's thread, coachmann's (although he seems to have stopped posting?), Allan downes etc offers tutorials to people in a way not even the best shop could hope to match. Others blogs and threads on building, dcc, track etc which are usually more detailed than magazines can provide and, like a club, people are generally happy to explain how they've done things.
Personally I read stuff, then google the item and buy it like that often.
David
[edit: I should have also remembered to mention the often erudite and informative discourses on prototype practice]