I want to add 154-155Ah, including the inverts and listed and letterted color varieties to my collection as varieties of the postage stamps. These stamps catalog for a few dollars or even pennies. I want nicely-centered copies, but I'm not after centering "gems" (just true VF -XF) and preferably never hinged.
ebay has sparse listings, and have exactly zero R155A stamps at all. The handful they have are not nice ones.
Is there a reason these are not readily available? Where could someone go to pick these up?