Need Help Pricing a Guitar And Possibly Looking for a Bass?

First off any Ibanez model starting with G denotes it as a Gio, Meaning its an entry level guitar, Kinda like Squire is to Fender, Basically these sell for around $120 to $200 new to be competitive with other manufactures that distribute Entry level guitars, If in really good condition its worth about $60 to $100 used, meaning 50%, but with the popularity of these guitars the used market is flooded with them so expect less if your in a hurry to sell it, selling it outright to places like GC you'll get about $40 to $80, although a trade in can be supplemented with a discount on the instrument you wish to trade it in on, Its complicated, but it works something like this, They're only allowed you give you X amount for said used gear but can make up for it with discounts on the new gear your trading it in for, But remember your dealing with salesmen, so if not adapt to horse trading and haggling this may not be that path for you, in other words if you can get the $60 for trade in value and a 20% discount you'll break about even without the hassle of selling on EBay and such