If it is a flat mulit-groove belt similar to the one used by the Jet mini, you will be able to get one from these folks for about half of what Delta will charge you. You will need the number off of the original belt so you are sure you get the correct sized replacement.
Link to site for purchase of JET belts;
Company name: Michigan Industrial Belting
Phone number:1-800-778-1650(order by phone-no web store)
http://www.mibelting.com/indbelt.htm
Here is another one:
http://www.aarubcorubber.com/
JET Belt Number: Carlisle Poly-Rib 240J