Picked up a couple Nats cards on ebay over the weekend.
Tyler Moore BCP138 Blue Refractor - #42/150 (Only 150 of these cards were ever printed)
Sammy Solis BCP106 autograph Refractor - #362/500 (Only 500 of these cards were ever printed)
Rick Hague BCP112 autograph Refractor - #/500 (Not sure of the serial number, but once again, only one of 500 printed)
Doubt I'll ever see a return on any of those... but it's fun to collect potential future Nationals while they're still bumming around the minors.