The first two examples are penny stamps,
common, even despised in some quarters.
You may pick them up from
ebay I should think, for a dollar or so.
The Pictormarks are a different story, never seen them for sale in 20 years or so.
No doubt they are around somewhere.
Happy hunting.
I do specialise in the Melbourne 1956 Olympiad,
but a modest collection at best
I even have a keyring kicking about somewhere



