is where they are sold.
Looks like you're like me and have 79's, so last I looked, only the 80 model assembly manual is available, but it is the same body as 79-81, so still works.
And the 79 Fisher body manual should be there, as well as 79 Service manual. Also, even though the 79 service manual was a supplement to the larger 78 manual, you only have to buy the 79 service manual CD, since he includes the 78 manual on it too.
He also has a Firebird parts catalogs CD, so you can look up GM parts numbers.