A look at what is currently available on eBay
 Hewlett Packard/ Agilent 83540B RF Plug-in 2-8.4 GHz US $2,895.95 
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 Agilent HP 83525A RF Plug-In .01-8.4GHz US $1,950.00
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 HP 83540B 2.0-8.4 GHz RF Plug-In -GOOD PWR US $1,300.00
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 HP 86240B RF Plug In, 2.0-8.4 GHz US $1,100.00
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 HP Agilent 83540B RF Plug-In Module 2.0-8.4GHz PARTS US $399.99
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 HP 86240B RF PLUG IN MODULE CARD 86240-60042 2.0-8.4GHZ (3-1-2-2) US $99.99
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What car stereo head unit for reading usb thumb drives?
I've been researching car stereo head units that read usb thumb drives in particular, and probably mp3 CDs as well. I thought the Sony CDX-GT610UI was a good choice since C-NET gave it 8.4/10 stars, but the moddedmustangs.com guys say Sony is garbage. Wal-Mart has a Sony GT61UI for around the same price as the CDX-GT610UI, but not sure what the differences are. Looks like it supports a pre-amp sub-woofer connection? It's around $165 list, but the Pioneer DEH-P690UB supports USB with an included cable, but lists for $219. Both are really a little out of my price range, but I'm not going to by the Virtual Reality VR3 nor am I going to get the Boss 630UA which are apparent junk. Some other people said the Sony CDX-GT610UI had Alpine-quality sound at a lower price. I might at some point consider the addition of a sub, which I'm assuming should really be driven off an amp? Or can I plug the sub into the head unit or drive it off the rear speakers? Suggestions please. --Steve
Alot of people do not like sony, personally i have nothing against them, their specs look great. pioneer premier and alpine are amoung the best out there, with kenwood right on thier heals. for usb i think that knocks alpine out. kenwood has a good deal hear... it includes the installation hardware for your specific vehical and the wiring harnes.. so its a better deal than the 180 price tag reflects. because the kit is required...
http://www.crutchfield.com/S-ocqHKXCHCN8/App/Product/Item/Main.aspx?g=300&i=113KDCX491&c=3&tp=5684