Their customer service is one of the worst and most ignorant I've ever experienced in years of online shopping. First, they have no number for you to contact them with, only a support desk, which would be ok, if they didn't take their precious time in answering your questions.
As someone who works in a foreign organization, I'm exempt from paying sales taxes, so I told them about the problem. No response for days. I then made it clear that I was very upset at their slow response and I was in a hurry to purchase the items, since they were on sale (for now), and their reply was not only ignorant, but obnoxious.
They reminded me that I only waited 3 days, suggesting it wasn't that big of a deal. They then told me that everyone pays state sales tax (IGNORANCE), so there's nothing they can do. Lastly they threw in a number (FINALLY) that I could call. Seriously, if they weren't having their damn sale, I'd rather lose and arm and leg before I buy something from them.