Can't find comps?

Yes, you can. You just have to know how to do it.

In trading cards, there is a huge variety of, well, everything. Serial numbering, autographs, memorabilia, 1/1 cards, printing plates, die-cut parallels. If you can imagine it on a trading card, it has probably been done.

I am a member of a number of Facebook groups ranging from hockey to Star Wars card to Marvel cards. Due to the high prices being realized all across the board, people are spilling in still at an alarming rate without really knowing what they are doing. These are groups that are well-established, so you can always tell who the new member is. It's not a problem per se--heck, we all want the hobby to grow! But inevitably someone will post "I just [pulled this from a box||won this in a break], and I can't find any comps. What is this worth?"

First of all, the general answer is always to check two sources:
-*sold* eBay auctions
-130point.com

Of course, 130point covers sold items on eBay, so there is a lot of overlap. However 130point shows Best Offer amounts, so there is a little more value using that site.

Anyway, people seem to expect there to be established values immediately on a product THAT JUST RELEASED! Spoiler alert, cards don't always end up on eBay right away. Especially in the case of breakers where cards need to be mailed to their owners. But this brings me to my point.

What is a "comp"?

Most seem to be under the impression it is an evaluation on the exact card they are asking about. Sure, sometimes that may be possible. In that case, you should have found it already on eBay/130point. However, for those lower print-run cards, oftentimes there won't be one of those on the market yet.

It's short for "comparable", as in "what would a comparable card be worth".

This is where you have to know what you're doing. For hockey, for example, you need to know who the top Young Guns are, or that there are more desirable parallels each year. Or just understanding the hobby in general. Your average Cup patch auto /25 is going to be more than an SP Game Used patch auto /25 of that same player. A McDavid will sell better than a Kopitar. A multi-color patch will sell better than a single color.

Veteran collectors probably know that Beckett used to have a listing of players they grouped into Unlisted Stars and Semi-Stars. This means they were roughly equivalent in value. They've done this for years.

Groupings are important for Star Wars and Marvel as well. Rey is more popular than a random Clone Trooper, but pretty close to Leia; Wolverine is more popular than Bishop, but pretty close to Venom.

As far as comps, do your homework. Use eBay. Figure out what that player/character sells for with, say, the same serial number. Or what those equivalent people sell for.

You pulled a base Qui-Gon parallel out of 10? Fine, find the /15 or /20 and... add a little more.

You pulled that Sebastian Aho SPGU Patch Auto? Cool, look at values form last year. They'll be about the same. Add a tad more since it's the new shiny product, but they'll approach the same value in short time.

Bottom line, there are plenty of ways to figure out evaluations. No one wants to see a lazy collector. Do your homework.