Very cheap for what you get as this is both the original GM pack and the newer GMs Toolkit.
The original pack comes with alot of the first edition material reprinted for second edition as well as an excellent introductory adventure which is one of the few published adventures not to be about chaos cults and mutants.
The GMs Toolkit comes with a very helpful information pack with lots of expanded ideas for setting adventures in cities and towns as well as plothooks and other adventure ideas.
Given that buying these packs in hardcopy is going to set you back at least 10 times the price on here, this is a very worthwhile purchase.
It's also my first experience with Drive Thru RPG and I am very impressed with the service.