Is there a current online price guide for paper money similar to the NGC price guide which give the Krause values?
PMG has one. I cannot vouch for its accuract. www.pmgnotes.com/priceguide/world-note-price-guide.aspx
Price guides are simply that a "GUIDE" the only one that i even subscribed to is the (Green Sheet for paper money) it gives somewhat close values as it Is a monthly publication, there is also the Grey Sheet i believe for the coin Guys, and one time published books arent even close to accurate as that information is already out of date at printing.