if i were you, i'd ask them the following:
1- what "video bitrate" they were going to use for the DVD?
2- will the audio on the DVD be in PCM (uncompressed) format or AC3 or MPEG audio format?
(you want PCM audio, to retain the maximum quality. AC3 is the next best... MPEG audio is okay, but the worst of the 3 audio formats within DVD specs.)
3- what equipment will they use to transfer the video, e.g. a standalone DVD recorder?
(you will have a MUCH better quality DVD if the video were transferred via Firewire from a digital8 camcorder then encoded with a good MPEG encoder, like CCE or ProCoder, or even MainConcept, than if the video were transferred with a standalone DVD recorder... period. some standalone DVD recorders can make *good* transfers, but during scenes with a lot of motion, they're very pixelated!!)
$150 seems a bit much, IMO. how long is the show? and what band/artist, if i may ask?
if it's a typical 2-hour show, or thereabouts, it should cost a lot less, IMO. (at least, if i were a company and charging for it, i'd charge a lot less for a video to be transferred.)