I have been collecting the AB backs (not really hoarding them, as I do have some duplicates but typically those came in lots). There seem to be some fluxes in pricing, at times I expect to pay a premium because I know the front/back combo is rare I put in a max bid that ends up being up to 4x - 10x what I end up paying.
As noted in my signature there are 4 more blacks and 15 more greens I need. Just finding a random one both colors will be about the same to find, but if you are looking for a specific front/back most greens are going to be harder than any particular black.
There is just absolutely no exact formula for figuring price on them. I at one time was buying up Pied 42 when I first got into collecting t205 but didn't find them interesting enough. I still have one, but sold off the rest and didn't get any premium even when advertised as P42.
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