Surely yes, b2s's birthday is a special occasion for customers to enjoy a bunch of great discounts, and attached are valuable gifts you can miss out on.

Of course not, most coupons may be used only by you when you received them directly from b2s. As the b2s coupon includes your User ID, it cannot be resold or transferred in any way.

To avoid this problem, you should check out carefully b2s promo code before that promo code could be expired, some promo codes are tied to a minimum purchase, a first-time purchase, or tied to geography, and other reasons.

Usually, Coupon Stacking is not allowed at b2s. However, the store will surely give out notice if available.

Yes, it has ever. It may not be available now, but it is completely possible for loyal customers of b2s to get it by tracking all of its promotion programs.

All deals from Promotion Programs of b2s are collected here. For each certain occasion, its coupons will be on the top of the coupon list, and surely they always come with an expiry date.