I don't know if anyone has been tracking the different counterstamps and has been keeping tabs on the prices. I have images of quite a few, primarily 1815 E's and 1825 L's which is in line with the relative rarity of the counterstamps. I have found the 15 L and 25 E to be the hardest to find with less than 20% of 1815's being 1815 L and closer to 10% of 1825's being 1825 E. I think Steve's book has similar relative percentages. I've personally seen fewer sales of the 1825 E's. I finally completed my set (I also have a duplicate 1815 E) last year. They are all out there for the finding but as far as a estimate of survivors there could be a total of few hundred of all of them. I see enough (including duplicate sales of the same coin) to consider them to be in the low R4 range for the common ones (15E, 25L) and mid-R5 for the uncommon stamps (15L, 25E). Of the common ones 15E in my opinion is easier than the 25L.
If anyone wants to see more counterstamp photos I've included mine (images below). They are also on Coinzip.
While high grade examples are the most often found, as can be seen from some of my images they can be also be found well worn. The lowest grade I have seen is a G4 1815 E. Highest grade is an 1815 E in MS65 (not slabbed). Many of the counterstamped coins have been cleaned, but that seems to be the norm for large sized bust quarters.
did come across the Alex Highland Collection sold at the Heritage Numismatic
Auctions, Inc.'s "Long Beach Signature Sale", May 31-June 2, 2001.
Unfortunately I do not have a copy of the catalog. Perhaps a newsletter
member who has a copy could take a look to see if it contained the 1795
dollar BB-52, XF-40 (PCGS). My notes indicate that the sale contained many
Pete Mosiondz, Jr.