You can still get new iPhone 5's from straight talk for $550. Same price as the 5C. It's the CDMA model and uses Verizon's network if I am not mistaken.
http://www.shopstraighttalk.com/bpd...ction=view&productVariantExtensionId=21724066
http://www.shopstraighttalk.com/bpd...ction=view&productVariantExtensionId=21724066