In days of old whenever we went swap-meet shopping We'd always carry along a PAW catalog. My last one is 1998 and was 1140 pages. (admittedly I didn't buy them that often (I have 84 89 and 98) and the guy that sold me that last issue stated I'd get the next PAW catalog mailed free to me - but I never got one, maybe there was no more after 98?). Odd I could not find any old PAW Cat's listed on ebay
Obviously the internet squashed the need for a parts house to print up 1,000+ page catalogs. It looks like PAW only sells on eBay and specializes in old HEMI's. Looks like they went the way of Super Shop's heck I recall Super Shop's sponsored the AA/FD of Don Garlit's.
Now other than the small-specialty engine builders and shops that specialize in markets it looks to be locked into a bi-monopoly of Jeg's and Summit that must have a massive percentage of the market between them. When you look at Ford Racing Parts the dozen's of Ford specialty shops all got the poison-pill when Jeg's and Summit became Ford Racing Parts distributors. The same whores that sell factory Chevy and Mopar perf parts..