IASCA has a test disc. Db Drag events have a test disc made. Pretty much all autosound organizations have test discs made, they are given with memberships and purchased at soundoff events. You might search under IASCA or USAC and see if they sell their reference discs online.
I use "Bass Mechanix" CD's here and they do pretty well. The only thing they don't have is pulses of a particular frequency.
Just do a search online for USAC, IASCA or db drag and you'll probablly find something