When I go to buy US Currency, particularly modern FRN's (1963-2003), I just have to do a "best guess" of what to pay. I've got Azpiazu's book but that's 2011. Coin World slowly cycles through that material but not sure how often. Any reasonably recent publications or websites for this sort of material?
The only up to date, i mean with in a couple weeks would be buy The ( currency green sheet) (coin gray sheet) actual books Are basically obsolete before they go to printing ! as they dont Reflect current trends.
The latest Standard Guide to Small-Size U.S.Paper Money guide (10th Edition) was published in 2011. The Green Sheet doesn’t list any modern FRNs at all. The Bank Note Reporter has mostly generic listings and lacks details, so checking recently “sold” listings on eBay is what most small size modern collectors use for pricing information and trends. There are many dealers that have websites with advertised prices that you can use for comparison. Here’s two of them. APD https://apdcurrency.com/ First City http://www.fstctycurr.com/
Here,s a link to both the green sheet for currency and the Grey sheet for coins just in case your interested in both it doesnt get anymore up to date then this. https://www.greysheet.com/Publications/GreensheetDetail