As mentioned above, take your time finding the right card for you. There will always be plenty available on eBay, but you should wait until the cards are at auction. Auctions tend to end lower or much lower than Buy It Now listings. Add the cards you like to your saved searches to make it easy to find new listings.
While it is great to buy in person so you can get a better look at the card, the supply will be very limited at any show. I think even the National will have limited options, and it will be a challenge to find them on the large show floor.
Good luck with your search, and please share what you end up getting.
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