Matthew, buying things from a disreputable pagan company isn't a compromise in principle, since there's no principle that says we have to buy from a particular source one way or the other .
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At the same time, I understood Marlear to be essentially talking about going above and beyond, recommending that people consider making a sacrifice via economic boycott. I didn't take her to be even suggesting that continuing to purchase from Amazon. I think it's laudable and preferable if someone can, just like it's laudable and preferable to fast, or to be celibate, despite the fact that most people most of the time aren't, and justifiably so. But if someone like Marlear doesn't bring it up than those who *can* might never even know about the opportunity.