Even if the #26 was very fine (VF), it would be worth no more than the $4.00 (although that is 2008 value and 2013 might be a tad more). Your stamp is something less than VF. Read the introductory Scott catalog section on centering etc.
Frankly, one could acquire this stamp probably for less than $1.00 by purchasing a collection on
ebay. In fact, I have a copy from a collection I acquired for less than 10% of catalog value. I'd scan the page if I had the energy). The page has #26, 27, 28 etc. and some earlier ones. My #26 is better centered than yours but has a little foxing that I need to clean up. I essentially paid 40 cents for my copy.
Just checked again and I have another copy from another collection I acquired for less than 10% of CV. The page has #22-#27, #29-32, #34-36.
So, from looking at my page, your first stamp is #26 and the second on top is #32.
I'm not trying to discourage you. Just trying to let you know that catalog values are at least 50% higher than reality and the stamp has to be in pristine condition to sell for even 50% of CV. The examples you have posted are not in great condition. But keep looking and just enjoy the stamps for their own sake, not because you're hoping you've struck gold.