This should be you last resort to purchasing books/UNLV gear! Emergency situations only.
The reason? The prices are ridiculous!
I guess I have been a professional student for the past few years. Being at UNLV long enough I know that Rebel Books preys upon students who don't know better. There are 3 brick and mortar bookstores serving UNLV: Beat the Bookstore, the UNLV on campus bookstore, and this place. After having priced compared all 3 places for the course of my multple semesters as Rebel, I can assure you that this place is the most expensive.
Their books are on average 10-30% higher than either of the 2 other stores. I don't know why they charge so much but they take pride in ripping you off. The rebel gear isn't cheap either. They have a decent selection but at $20-30 a t-shirt, you can go to wal-mart and get twice as much Rebel clothes for your money. Just not worth it.
On top of that, they seem to think that everyone who comes in is going to steal. Upon entering you must place whatever backpack/purse/fannypack you have on a big rack before looking around. After that, one of the employees will watch you like a hawk and follow you around the entire store. Maybe they have a theft problem, but customer service should not have to suffer as a result. Also expect to have your bags checked upon leaving (even though they were sitting on the rack in plain sight the whole time).
The only pro about the place is that they consistently have everything in stock. Maybe because nobody can afford their high prices, but if you are in dire need of a book before an exam, Rebel Books probably has what you need.