Hey, hey, didn’t read the whole thread, so forgive me if I’m reiterating some things people have already said.
I’m a vendor, so I have some insight into this, and will speak to my experience in the states.
DO NOT SELL TO A CARD SHOP. They usually only give 50% or 60% of comp because they need higher margins to run the store.
Grading
Definitely grade your high-value mid-era cards mainly because it takes the guessing out of what the condition it is. They’re older cards, so they won’t have the volatility you see in the modern cards, and you can be sure they’ll have the same value or more in the next several months. In this market, PSA generally has the highest value and the most interest in the market. Beckett, TAG, and CGC are fine, but folks are really only interested in them in the 10s. Sidenote, CGC specifically needs to be a Pristine 10, and some folks just won’t deal with TAG cause it’s new and it’s hard to price.
Lugia example for grading:
last sold on ebay
PSA 8 - 1750 USD
PSA 7 - 1275 USD
ungraded - on ebay you can’t find a card in the same condition so hard to say. TCGplayer most of the time doesn’t include photos so again hard to say, but the last sold LP was $900+ usd. At a glance, your card is probably in the range, but if it were graded, it would remove a lot of the ambiguity.
Pricing
TCG player is really good for modern singles and somewhat good for mid-era vintage cards.
For the Lugia and other high-value mid-era, your best bet is to check last sales on eBay or use Card ladder. Card ladder is a pay-to-use, but you get the most up-to-date sales on eBay and Fanatic. I would not recommend using price charting just because it’s not accurate - nobody uses it at shows.
Condition
You really need to know how to condition your cards. Folks will try to talk you down condition in hopes of getting a better deal. The difference could be 10s to 100s of dollars. Grading comes in handy for this
Selling options
Ebay
They take like 13%, so in an ideal world, you’d make 87% of your total, not including packing costs and such. In the US, you also have to pay taxes on your 20k profit. Not sure if it’s the same where you’re at.
Ebay consignment
Haven’t used it, but like ebay they take a percentage and really only accept higher-end items
Local Vendors
For vendors, their floor is typically 70% and can go up on higher value cards. Reach out to vendors in your local community via Instagram and see if they would be interested in buying a collection (they usually are). Or go to a show if you can and meet some in person and talk to them about what you have. Since you’re in the 20k range, you probably need a bigger fish, so consider that. Next, you need to set up some time to meet with them and review your collection piece by piece (I do not recommend shipping it out to them for them to check the condition privately). For lower-end items, accept the 70% and move on (think 70% on a $5 or $10 card). For the high-end, negotiate a higher percentage (90-95%) because they’re highly liquid and can be sold quickly. Lastly, the place where ya’ll review the cards needs to be safe and secure. It’s kind of a weird time; there have been a lot of Pokémon store break-ins recently.
Online creators
My mind goes to Oyama Trading - A very trusted creator in the community, and has videos of him receiving collections before payment, and then he takes the time to review each card and price them fairly. He’s pretty responsive on IG.
Hope this helps - it’s honestly kind of a marathon for the best deals, but well worth it if you can wait.