1. 1997 Best Minor League David Ortiz #74
A Connecticut card and a pre-rookie issue of a player I collect. Even at the current COMC asking price it's more affordable (and more interesting to me) than Big Papi's Fleer RCs. I never got to see Ortiz play for New Britain; he was only there for half a season and there was another minor league team much closer to home...
2. 2003-04 Topps Pristine Ed Belfour #31
The last base card I need for what might be my favorite hockey set of all-time. I could Buy It Now on eBay for about $5.50 w/shipping - but I refuse to pay more than $3 for it. That's what it sold for on COMC a couple years ago - and I passed.
3. 2007-08 Black Diamond Carey Price RC #194
The last card I need to complete this set. I have the Patrick Kane and Jonathan Toews RCs in BGS gem mint, so I'd prefer the same for this card - if the Price is right. That said, if someone has an ungraded copy for trade or I can purchase one under $30, I'll take it.
4. 2017 Topps Heritage Kris Bryant high number SP #500
I'm still about a dozen cards short of completing the entire Heritage set (including high numbers) but Bryant is the biggest name I need (and he's a player I collect, too.) I could have bought the 'regular' version during COMC's Black Friday sale but I got the Mike Trout SP instead.
5. 2017 Panini Pantheon metal base Brett Favre #35 (#d/50)
I didn't even know about Panini Pantheon until I saw the metal base cards on COMC. This Favre sold for about $20, which is probably a good price considering they're numbered to just 50. I'm stretching the definition of "attainable" here, but I added it to the list as a reminder to keep looking.
2017-18 Upper Deck Nico Hischier Young Guns RC #201 (purchased from COMC)
This is the easiest card to find on my list, I'm just being lazy and/or cheap. I'd be happy to pay $20 for a copy but I've got other priorities at the moment. Perhaps I'll spend a little extra and get a BGS 9.5 copy in the next year or so.
7. 1996 Best Todd Helton #13 (New Haven Ravens team set)
When I lived in Connecticut I went to about 5-10 Ravens games a year (Yale Field was less than 10 minutes from my house.) Of all the players who passed through New Haven on their way to the show, Helton was by far the best. I've picked up a few Ravens teams sets over the years but I've never even seen this one for sale. The Helton card is out there though.
2015-16 O-Pee-Chee Platinum Connor McDavid retro parallel #R97 (purchased from COMC)
9. 1975 SSPC Superstars Ted Williams #19
10. 2003-04 Topps Mario Lemieux Lost Rookie Cards #LRC-ML