I know this isn’t to do with coins but for my online store I would like to know more about older US notes or current to add along with my coin collection. I currently use the PCGS grading app that shows a given price per the coons grade and also the red book. I see a lot of US currency graded and ungraded on eBay and other places. Is there a site such as the PCGS app where I can look up the Bill type and go off of a grade to see its worth? My apologies if this thread does not go here but I’m not sure who to ask and I think maybe a few of you guy/girls may mingle with currency as well. Thank you in advance!