I took a chance on a lot of JG stuff and this was included.  I know it is a 1980 Judges Guild Distributor Catalog - but there isn't much other info on it that I can dig up regarding value.  Mostly in great condition aside from some marks (in pen) where a few items were marked with a check or and "X."  Any ideas on what it is worth?

How many pages and what does it look like inside?

Good questions.  I count 26 unnumbered pages. Item not dated anywhere and there is no obvious evidence that it is incomplete. Highest number on the order blank is 150.  Descriptions are given for products with the highest number being 124 (Escape from Astigar's Lair).

Cool...I kinda was thinking the same general range and ultimately $40 is about what I paid (it was part of a mixed lot).

In researching I did search this forum and only came up with this mention below from Sat Aug 26, 2006:

Was finally able to pick up the Distributor Catalog.
Previous two went for over $100 and $200 IIRC (the 2nd was a Burntwire Brothers auction)

This info, coupled with the Item Index listing for JG stuff which lists the 1980's distributor catalog as having a rarity ranking of a "4" (but no associated value/condition), however, still suggests it might hold a bit more value.  

Curious.  I'll keep digging.  If nothing else, it looks like this one is a variant of the one listed here:

Judges Guild Catalogs


CP

Worth mentioning that the rarer TSR catalogs use to sell for $75-$100.  Distributor Kits sometimes higher but these usually included a number of other items of interest.