I have no idea if this is a reasonable price, but the mentioned product is a self-contained measurement system in a ruggedized enclosure with built in computer

I have no idea if this is a reasonable price, but the mentioned product is a self-contained measurement system in a ruggedized enclosure with built in computer and software that identifies isotopes automatically. It is marketed to "homeland security" type agencies, so expect it to have quite a sales-margin :-) If you'd want to be on the cheap side, there's a used Ge on eBay for $3k right now, add a HV supply anda suitable ADC card for your PC and you can go recording γ-spectra in no time, possibly on a $5k budget. As you'll have to identify the isotopes yourself, check http://www.inl.gov/gammaray/catalogs/catalogs.shtml http://www.inl.gov/gammaray/catalogs/catalogs.shtml for reference spectra.