The best way to appraise this item is to see what items have actually sold for recently on eBay.  Make sure you are logged in to eBay, then enter a search query for an item like "B10 D&D" and then check the little box on the left hand side that says "sold listings."  For me, that gave me quite a few items, and some of which are sales of items you are selling.  Add more terms to refine your search if needed.  When evaluating these sold listings, you have to factor in shipping, condition, completeness and many other factors which can affect a final sales price.  You may notice that similar items sell for very different prices.  By using this process, you'll be able to evaluate almost any your items for sale(unless they are super rare with no sales history).  

revcorik242 wrote in Module BX/1 With Uncut Counters:Yes, checking sold listings is the first thing I do, but I can't find any reference to this module with uncut counter sheets.

Look again.  If you do an eBay search for "B10 D&D," one of the sold listings featured un-punched counters.  However, it should be noted that the seller of that listing is considered an un-trusted cheat in this community.  

revcorik242 wrote in Module BX/1 With Uncut Counters:Yes, I did see that, but my copy has the BX/1 sticker over the original B10 Label, so unsure if this would affect its rarity or value. Thanks again.

It's often rare to find an identical condition, seller rating, printing, shipping amount listing on eBay to whatever you are selling.  At that point you have to use common sense.  Stickers on items are discussed on these forums in other places.  The bottom line is that the value of any item is what someone will pay for it.  I've seen items that usually sell within a certain range sell for more because of the selling acumen of the seller.  It's even more common for items worth much more sell for less because the seller had no selling sense.  

Why waste your time with DF? The denizens of DF dwell deeply in the their immersive belief that all products should be free and available online. They would never pay $50 for a module. Heresy!