There are pawn shops, and then there are pawn shops. Not all of them are run by people who think they have to get top dollar for everything on their shelves. Some or even most of them may be, but it is well worth your while to find a pawn shop that wants to move merchandise at even a small profit rather than sit on it forever at silly high prices.
Since I spent most of my working life as a Department of the Army civilian employee, I've lived in or near "army towns" most of my adult life. Military towns usually feature bars, tattoo parlors, car lots and pawn shops pretty heavily among their other businesses. So it's always been pretty easy to sort out which pawn shop or shops I want to deal with, as there has been a good number to choose from any place I've ever lived.
First of all, visit EVERY pawn shop in town. All of them. Look around, get a feel for the atmosphere of the place, see how customers are treated, how the merchandise is priced, etc just as you would do when evaluating any business you were considering for a purchase. Sadly, in my experience, one visit will be more than enough to let you know you're wasting your time with most of them. By the way, I literally grew up behind a store counter (my dad owned a small country store), and I know what 'good business' feels like. If I don't feel it in any business within in the first five minutes, I know there's no use looking any further there.
Once you find a place or two that seems promising, follow farscott's advice above. Go in regularly and buy the incidentals you'd be buying anyway. Talk to the counter help when they aren't busy with customers (but don't be a pain). Learn who the manager or owner is, they will 'drive' the atmosphere in the business. Get to know that person over time.
Look for good deals on previously owned items the shelf and don't be afraid to ask if they can do better on the marked price on those. If you are a regular customer and don't quibble over buying incidentals at marked prices (and they usually have little to no wiggle room on new items like accessories, cleaning gear, ammo etc), they will be more likely to help you as much as they can on items where there might be some flexibility in prices.
Not all pawn shops are alike, and it is well worth your while IMHO to find the good ones and give them your business.