If you really are interested to know current "trends" here's a few suggestion. Look at online auctions, eBay, Torex ect, go to money conventions, sign up to the Canadian Paper Money Society, buy a current Charlton book, buy old Charlton books and compare them, use the search feature on this site, try and find links to the dealers websites and inventory and after a few years (takes some time) you will have a much better idea of "trends". If your looking for a website that you can enter a serial number and get current prices as one would do with a stock quote, you're truly out of luck.
MG