Hi Sharon,
I keep tabs on the current resale value of my set by occasionally visiting ebay (www.ebay.com) and typing " Frankin Mint tokens" into the search box. I checked this morning and see only one set for a buy-it-now price of $425.00....I know I bought my set cheaper (alot!) than that though. You may have to keep checking for the next several weeks to see what auction prices really are.
You did not mention if your set includes the binder, as that makes a big difference in resale price.
Hope this helps...