Pricing for basic "pro" series tippmanns (Pro-Am, Pro-lite, 68 carbine, Pro-Carbine) is generaly as follows.
Poor- 10-20 USD
Fair- 20-40 USD
Excelent- 90-180 (this normally includes the box and all goodies)
Factory built MIni-LItes will add 20-40 bucks to the standard pricing, aftermarket "minis" can add about 10-15 bucks.
FA's go for anywhere from 50 for poor/parts guns to 300ish for good ones