For used, ebay is a great way, shops don't normally sell or push used bows, however you don't get to put your hands on it first.

If you shot a bow at a shop and then bought that same bow online, you did the shop a disservice, you used thier time and expertise to setup and test it, then went elsewhere, this is just wrong.

You will pay a bit more at a shop, however you are getting more, you are getting someone to help setup the bow and make sure it fits you. Many first time bow owners are way overbowed, both length and weight, a good shop is priceless in getting this right.

A first time bowowner has little idea of how to setup and tune the bow, a bow shop will probably do this for free as part of the "added" purchase price.

A bow shop will do the warranty work for free if needed.

A bow shop will probably help you out getting your form right.

A bow shop will probably toss in some "extra" stuff for buying the bow there, x hours at the range, periodic tuneup, putting the accessories on and tuning.

Buying on line is a crap shoot, if you do not have the knowledge and experience to both setup a bow as well as know what size bow you need, you will then probably either not be happy with how the bow shoots, or will spend the "savings" at a shop getting the bow setup to fit you.

When I worked in a shop, it was normal and expected, to spend 1-2 hours with a person when they bought the bow. When they left the shop, the bow was tuned to shoot well for them, and if they were a new shooter they also got some free instruction on how to shoot it.

It may cost more upfront, but long run, the shop is the best deal. Especially for newer archers.