Here's a link from the third gen f-body board with lots of helpful tips and places to get burners, erasers, and eproms. For eprom, I usually use JDR enterprises, the link is mentioned in the article. For a burner I use the Pocket Programmer II, also listed in the article, it burns almost any type of chip for any car using an eprom. http://www.thirdgen.org/newdesign/tech/promintro.shtml
Another helpful tip: get a 8 or 16-position thumbwheel selector from Caspers, then you can burn 8 or 16 GN chips into 1 eprom and select which one you want to use..and you can use the same AT 32k chip (for the 8-pos thumbwheel) mentioned in the article for the TPI applications and not have to buy an eraser since they are electronically erasable you just program right over them.