Had a bit of a headache using the Inventables Voucher code so I thought I’d clear up the problem I was having. When you are going to checkout, click the cart. On the right, there will be a box for “promo code”. This is where you want to use your FIRST voucher. If you get to the entering address / information screen, there is a second box called “Apply Gift Cerficate”. This will NOT accept your voucher code.
I clicked through the first screen too quickly and then wondered why I couldn’t put the Voucher code in the Gift Certificate box. Cost me 20 minutes of kicking around to find that first screen again. Also, the voucher code doesn’t cover shipping, so load up on $100 of stuff.