It wasn't from Wikipedia. I knew there was a law in place that allowed for online stores to be tax exempt. Wasn't sure what it was, so i looked it up. I never hid that fact. You know, hence the quote boxes.... If more people did that we'd have better discussions.
@ghost - they didn't raise any prices. Simply their free shipping threshold. I personally don't think they owe me any notice because theyre under no onus to offer free shipping in the first place.