Is there a site kind of like greysheet that has prices for ancient Roman coins? Thank you in advance!
The closest thing was probably the Roman Coin Price Year Book series by Morten Eske Mortensen; though I don't think he has done any in the last few years. There are also books like David Sear's Roman Coins and Their Values but the most recent volume was published in 2011; so it's not very helpful with current values. The best resource for prices is a site like acsearch; which gathers info from many auctions. You have to subscribe though and remember that many of the auctions are higher end, with higher prices. There is no substitute for knowledge of market prices based on experience though.
Ancient coin values are much more volatile than modern coins. For example I recently purchased a coin from a Leu Numismatik's auction. I purchased in on 07/16/24 for about $61, it was purchased by Leu's from another prominent dealer on 09/11/23 for $78, and it was previously sold at an auction on 12/07/21 for $45. Basically you can buy a coin today and in a month break even, make some money, or lose some money. It all depends on what someone wants and what there willing to pay for it. The best "price guide" are recent, within the past year or two, auction sales that can be found at various auction websites, of which acsearch.com has a pretty consolidated list.
There's also other factors besides stated grade, patina/toning, provenance, centering, artistic value, environmental damage, etc. Aside from some very high end coins it's about how much one individual is willing to pay for a particular coin. Some coins are fairly stable, however. A very nice Heraclius Isaura follis was $125 in c. 1998. A passable one is c. $175 now. The S805's were cheap back in the 1990's, and are cheap now.
