I think I found a way to curtail my spending - open a separate checking account (with check card/VISA) (either at your own bank or at an online one like ING direct) and make that your payment option for your Kindle stuff. Of course, for it to really work, you would have to delete all your other active payment options, so Amazon won't just default to one of them; also remember to keep the checking account balance at whatever their minimum is.
But still - it just might work! Whaddya think?
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