That is not a legitimate website, all of those are counterfeits.
This hit the nail on the head.
The stamps youâll see a discount on are typically pre-2000s, and certainly before the age of forever stamps. Sometimes dealers will sell large lots of forever stamps at a slight discount, but I would say that any discount that is more than 10% off of the face value is concerning and approaching the too-good-to-be-true realm.
Stamps sold at a discount are usually ones that are extremely common with many millions of them produced and low in demand among collectors. Stamps have a Face Value (the value printed on them) and a Catalog Value (the amount they are worth to collectors, based on the SCOTT catalog, fluctuating based on supply and demand)
So for example, the Vintage Rose Forever stamps issued in 2015:
These stamps carry a postage value of 68¢ each, but hold a catalog value of about $3 each. This is because these stamps are high in demand among people mailing wedding invitations, and why many other love and wedding-themed stamps are worth so much.
Then we have very common stamps like the 37c flag:
There were MANY of these stamps printed and theyâre extremely common, so their catalog value is barely above face value. As a result of that, stamp dealers will sell them at face value, or slightly below, in order to clear them out of stock and make some revenue instead of having them sitting around.
Collectors like sheets intact, so stamp dealers with partial sheets will lot them up and sell at a larger discount. Maybe they have a block of 6 stamps from one sheet, a block of 12 from another, a block of 4 from another sheet and so on. They will put many of these together, add up the total postage value, and give a slight discount, likely less than 20% off of the face value.
You can find trustworthy dealers by looking on the HipStamp website, or if you like to shop on eBay many reputable dealers have something in their store about how they are recognized as an official dealer by the APS (American Philatelic Society, a very reputable organization for stamp collectors) or the ASDA (American Stamp Dealers Association, another very reputable organization)
If you are on eBay, you should consider staying away from selling accounts that were recently created or have low feedback ratings.