For me it was, believe it or not...a checklist! In 1996-97, Topps short printed the checklist big time. I don't remember how the odds were layed out, but it was not common. I even bought the factory set, figuring I would finally get it that way, even knowing full well that most of the cards would be duplicates. No checklist! I considered that false advertising, and I still do...you can't call something a complete set when it's one card short! I never stopped looking but I never found it...card shows, shops, online once I got a computer in 2000...no luck! Finally, in 2005, I found one on Trader Retreat. I paid $15 for it, I know because I saved the receipt from the money order! Finally, the card I had been chasing for 9 long years was mine! It was a great feeling to finally get it, and complete that set!
I have two other cards I chased for years. I was very sick for the 1996-97 school year, I was in 6th grade. The doctors never could figure out the problem, but that's another story. My mom bought a box of 1996-97 Metal series 1 amd every day after school she would give me a pack. Eventully, the box was finished and I came up 1 card short...card #1. I hate being one card short...even more when it's card #1! It took me years to hunt down that card, and I finally found it in the 1999-00 season. A friendly card dealer broke a complete set he had for sale for me, I never knew his name but if he reads this, I still say thank you over a decade later!
The third one still makes me angry to this day. Again, 6th grade. (my first full year with basketball cards) I had just made a trade with a friend for, among others, 1995-96 Upper Deck Special Edition Shaquille O'Neal. Well, to make a long story short it was stolen that day...by the teacher. (He also collected cards) I eventually replaced it at a card show but it still makes me angry.
Currently I don't have any particular cards I am chasing. There are plenty I want, plenty out of my price range but none that I am really going nuts looking for. A Jeff Gordon autograph would probably top my want list but they sell for a bit more than I can spend on one card...I'm hoping to pull one some day.
VERY slow trading due to health problems. Not transferrable so safe to trade with, just moving is painful and can't always access the cards.
Cardboard History My COMC
New Collection Website: Cardboard History Gallery (Still under construction)
Tips on how to make your scans look like the card does in hand (No more washed out, fuzzy scans!):