Hi, those are part of a set from the BOC I believe. I imagine they are thus a percentage of the full set price.
However, if you were to find notes made for circulation with matching numbers, then the rarity would be much more, since piecing together sets like that from circulation is next to impossible.
I do not know if there has been enough market activity in them to warrant a stab at a "market" price. But hey, I do not get to many shows. I have seen dealers sell a matching $5 and $10 for about $70 or so.
All I know is that they are very hard to find - if not from a set.