$Grant is your guy if you go by Beckett yearly guide.
If I remember, this set was huge! About 700 cards. Per hobby box, these came out around 3-5...they were not in retail packs. But the highlights were "harder" (along with the RC's) and considered more rare since most of the cards that you saw was of the regular base set. I don't think that a premium was added since the rate of any /100 card was the same over all the run of production.
As you can guess, Crosby and Ovy are the highlight of this set, with Crosby getting most of the listings for the /100 set other than Ovy's & Richards (?) RC parallels. The Beckett yearly for 2015, which some of this information is from, does not have a 'X' multiplier for the /100 parallel set.