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I suspect I can't buy any because I have 4 credits right now. Usually the deals on credits only show up when you get down to zero on your account.
Might have to consider going ahead with the ones I have, then using the $20 to buy credits (if, that is, I can access the deal then). Other choice is to use $20 on a book and save credits (but, using it for credits is a better deal in the long run, as many 1 credit books are $20-$35 if paying for them otherwise).
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