Looks like the '98 Destination Cooperstown insert may be experiencing the same price spike that we recently saw with other similar, non-numbered, hard to find inserts from the late 90's (e.g., '97 A Cut Above, '96 Hitting Machine Gold Medallion).
http://www.ebay.com/itm/KEN-GRIFFEY-JR-1998-EX-2001-DESTINATION-COOPERSTOWN-7-/221531707562
Slight bummer as I've been looking to add this card to my PC and was planning to get involved in the bidding, but now will just have to wait until the price comes back down to its "true" market value.
http://www.ebay.com/itm/KEN-GRIFFEY-JR-1998-EX-2001-DESTINATION-COOPERSTOWN-7-/221531707562
Slight bummer as I've been looking to add this card to my PC and was planning to get involved in the bidding, but now will just have to wait until the price comes back down to its "true" market value.