tl;dr How do you price your cards, specially Old School stuff? Also, what if you need to price a huge amount of stuff and don't want to do it card by card?
Options I checked: SCG, TCG, Deckbox, MTG Stocks
So, I have a huge Old School/Vintage collection to sell, but I have no idea how to price it right. Newer cards are easy enough, stuff that plays Modern/Legacy, etc. But I'm finding it very hard to price Old School stuff right, specially since it's such a huge collection that it would be very time consuming to do it card by card.
I'm looking for a way to price the cards and something that's easy enough to do "semi-automatically". For example, Starcity Games has an advanced search that lets me list a whole set. From there it's easy enough to copy everything to Excel and copy the prices. TCG has that too, etc.
The problem is that SCG and TCG prices seem way off. Starcity games feels waaaay too overpriced. Stuff like UNL Lotus at 15k seems off. TCG on the other hand can't keep up with Old School prices (it lists Unlimited Underground Sea at 500 dollars for example... https://shop.tcgplayer.com/price-guide/magic/unlimited-edition). To note: I'm using TCG's "Market Price", so I wonder if the "Listed Median" is more accurate (although they say in the site that "Listed Median" is not a good way to price stuff).
I also tried Deckbox.org, and their listing prices seem OK, but there are some cards that just seem off. LED is a good example: 210 in SCG, 225 in Deckbox, 195 in TCG). But overall if felt like the prices were more up to date than TCG and overall 20% cheaper than SCG.
Then I went to MTG Stocks and they seem to have the best grasp on card prices so far - in a way that I'm probably leaning towards their listings. (Ex.: UNL Lotus $7862.00; UNL Sea $1247.49, etc)
I just need a consistent way to understand prices. For example, if the conclusion is that Starcity actually updates their prices more thoroughly but they're all 30% more expensive than market prices, I could just do something like 30-35% off SCG or something like that.
So, how do you guys do it?