so after being told by just about everyone who responded I've decided to buy a new vape I'm buying a Smok G-Priv 2 Luxe Edition from a friend for $80 I would now like to know what I should look for when inspecting the vape before buying it.
Looks like two others already posted what I said earlier. A new device with warranty sells for about $80 or less online. Originally, the Gpriv2 comes with an atomizer (smok TFV8 Baby Beast), and many places offer free shipping for orders over a certain amount, so you can probably get the shipping free. Keep in mind, this is for the unit itself.
When you're looking at a mod of that size, I recommend getting four batteries and an external charger as well for just starting off. Technically, you can charge the batteries while in the mod, but external chargers allow you to charge a second set of batteries while you vape on the other two. Although I haven't seen any information on the Gpriv 2 charging, if it's like the original Gpriv, it does "balance charge" the batteries, but I've heard that it charges slow. Having the charging port on the bottom doesn't help, since you have to keep the mod turned on the side to charge making it inconvenient.
The last thing you should look at, is batteries. That's a whole topic in and of itself, but good 18650 batteries can run $8-$12 each online. Just a short list of three recommended batteries are the Sony VTC5, LG HG2, and Samsung 25r. There's a whole lot of topic and debate as to the batteries, but those three are three of the most popular ones and are three that I, and many others on this board, will recommend.
Now all this being said and done, local prices and vape shops will charge much higher than online prices. This is normal. If your friend bought it locally, he may be offering you a lower price than what he (she) bought it for. So it's up to you to determine if it's worth it. For that price, I would be more concerned with scratches, overall quality of the mod itself, and what else it comes with. It definitely should come with the atomizer since those sell for $20-$30 by itself) The kit comes with spare glass for the atomizer, and a spare coil. The Tpriv is a good mod, so no worries there.