I would recommend getting set up at a shop also. Getting properly fitted is critical, for sure, and it's an excellent reason in itself to buy your first bow in a shop. Avoiding getting burned on a used bow that's a wreck waiting to happen is another.

Dealing with second hand bows is best left to those who know what they need and know what mechanical problems to look for. There are a lot of older bows out there that have tons of good shooting left in them, but there are also just as many junkers that people are trying to pass off on the unknowing.

When someone buys a used bow, they should take it to a shop and have the bow thoroughly serviced. Cleaned, lubed, inspected and have new string and cable(s) installed. You're generally talking around a hundred bucks for that work, so that cuts deeply into any savings you're looking to walk away with.

Since price seems to be your prime concern, you do not want to risk wasting your money on potentially buying someone else's junk. An alternative.... PSE has several great starter bows with pretty small price tags, and they're available as kits with arrow rests, sights and quiver. Any one of them makes for a solid bow that'll get you going well on your way. It's pretty hard to find a shop that doesn't sell PSE.

Welcome to the forum!