Eight cents, for sure , if unused, and you can use them for postage.
if used, not much . If you have 100 of them, soaked off in good condition, you call sell them for 50 cents, provided you have enough other stamps to sell to bring your total offering up to $50.00 and you pay the postage to get to NY. Some dealer might pay 1 cent each for them , if he needs them for his stocks, and you offer them for sale at auction and see what they will bring.
i have a book of Australian stamps from 2006 and it says the mini sheet is worth $2.50
That would be Scott number US 1745-8. A full sheet of these stamps has a catalog value of $21.00.
It is worth 2.50 for bronze and 5.00 for silver
These are still quite common whether you mean the 20 cent regular issue or the commemorative which was issued soon after he dies. Its retail value in good condition - no missing perforations or thin spots and full gum if unused and lightly canceled if used -- is from 10 to 20 cents retail. Dealer would charge up to twice face for the mint stamps. Wholesale, the value is 50 cents to 75 cents in lots of 100 for the used commemorate and 15 cents per hundred for the 20 cent regular issue. Unused about 65% of face if you have enough unused stamps to make it worth a dealer's time. Full sheets and plate number blocks can often be sold for full face and maybe 20% more.
$57.50 (Brookman Catalog)
Scott #US3226 You can purchase a mint copy for about $1.75. A sheet of 20 stamps will cost you $35, you might be able to sell a sheet for about $10 if you can find a dealer that wants them.
That would be Scott number US 2496. A full sheet of these stamps has a catalog value of $44.10.
That would be Scott Number US 1755. A full sheet of these stamps has a catalog value of $40.00.
Mint US stamps are worth their face value to use as postage. Dealers usually charge twice face for common US stamps, so you could say its retail values is $0.40, provided it is well centered and still has all its gum.
That would be Scott Number US 3561-3610. A complete sheet has a catalog value of $36.75
$20
That would be Scott number US 1124. A full sheet of these stamps has a catalog value of $11.00.