I Need Some Price Quotes On Rims/Tires for Late Models

[2001GTPEWTER]

I have a 2001 GT, it currently has 17" alloy GT Bullit rims which are awesome..but when the tires on those are worn down, I wanted to keep the rims but get a different set to use. I figured I might as well get a rim/tire package (the ones that are mounted but not balanced and sold as a set)..Listen up, theres a supplier on Ebay Motors that has practically every model rim for late model Mustangs (Chrome, Alloy, 17", 18"..etc.) But hes' charging anywhere from $875 to $1020 for these brand new tires and rims. I'm looking to get a set of 17" Chrome Cobra rims (with the tires mounted) he has them available for $875. Someone just try and give me a hint on whether or not this is a good price, I can't afford to BLOW any money for a while, not with what I just spent getting my Flowmaster and putting it on..