Ruari -
Depends on the turn time your friend needs. The CD/DVD replication plant which houses the mastering studio I work at - Europadisk
http://www.europadisk.com - can offer the finest quality in pressed & silkscreened discs for very low pricing and is a 10 minute subway ride from midtown Manhattan. Our turn rime currently is around 2 weeks for discs, and about 4 weeks if you need a complete package with jewel cases & printed inserts, or CD jackets or digipacks.
You can pm me at steve at europadisk dot com or call 800-455-8555 x 325 or 718-407-7325 for a quote.
If you're in more of a rush due to a limited stay you can get CD-R's with thermal printing done quickly (i.e. in 2-3 days) in Manhattan at places like RLL Sound Labs or the Engine Room
http://www.engineroomaudio.com/. If your friend picks up the Village Voice while he is here there is a classified section called "Clef Notes" that lists a number of other places that offer similar services that he could also get quotes from.
The disadvantages of the quick turn CD-R services is that they generally cost more per unit, are not 100% compatible for every player, and the on-disc printing is not as high quality as pressed and silkscreened CD's.
Best regards,
Steve Berson