Since an APS circuit contains well over 1000 stamps, some of which exist in multiple copies mounted in several different books, I modified the wantlist worksheet I keep in Excel to help me track which books contained the stamps I needed with the best price.

You can see the top part of my tracking sheet below. The left column is the Scott catalog number ("1/4/12" indicates that there are three different Scott numbers that would work in the space provided). I use the second column to compare the price of more expensive stamps in the circuit books, usually $20+, with the same stamps in the APS Stampstore. The third and subsequent columns correspond to individual circuit books.
On several occasions I've thought that a stamp in a circuit was a good value only to find a better price elsewhere. Of course, if we're only talking about a small difference in price, I would rather purchase a stamp that I can examine in person. But as you can see from the second item, the StampStore has a acceptable copy of Canada #17 for almost half of the one in the circuit book.
Before this circuit, I lacked 54 Canadian stamps. I now need 33. Unfortunately, that includes most of the Large Queens and some other pricey stamps, including that perennial favorite, the "Blue Nose." Actually, Canada has several lovely 1840-1940 ship stamps of which I have two:

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