I did one search on eBay and see them from $50 to $120 used and $150 new. How about $85? I need to find out if it can be switched to AT&T. I'll be in Boaz tomorrow and Sunday so I could come meet you.
If the Verizon phone has a SIM tray, it will work on AT&T but you have to buy a micro SIM from ATT or trim your current SIM card to fit the Verizon phone. Some older Verizon iPhones don't have a SIM and won't work on ATT. You can Google videos and tutorials online that show you how to do it. I bought my wife a Verizon phone, trimmed the SIM, and have had zero issues.