1. Sign up with this link and confirm your email to get $15 that can be applied to anything in the store
Otakumode.com/invite/a98a4e
2. Add game/figure to your cart
3. Apply store credit+coupon during checkout

Also there is currently a promotion where you can win a coupon worth up to $50, possibly making your purchase cheaper or even free.
Otakumode.com/shop/special/autumn2015