I think Spring13 only works for new customers. It worked for me and said, "Welcome to the Hive".
FYI, shipping is $6 whether you order one or two. So, one is $21 shipped, and two cost $31 shipped (after code SPRING13). It also defaults to 2-day shipping, so be sure to change that unless you want to pay $11 for shipping.
I'm not sure if the coupon will invalidate it, but my favorite CB site had 3.5% CB.
Edit: I think it took me about 25 minutes total to check out.
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