Some people called attention to this in Fin17s Gearbest thread a few days ago, but I did some digging and found that they were only scratching the surface.
Basically, there are a few big promotions on selected flashlights (and other products) when you buy ≥ ~$50 worth. The coupons are displayed in red at the bottom of the price section on the product page. They apply even to already discounted products on flash sale, etc.
There are a few broad discount categories. $50% off > $20, $25 off > $50, 40% off > $50 & 20% off 2 or more, 30% off 3 or more (doesn’t apply to every item on that page).
Some examples
The OTR M900 is now ~$30, but if you buy two, the price with coupons is $18, which still isn’t bad with battery and charger.
The UTorch S1s are on flash sale (for a little longer) for ~$20 AND they can be combined with the OTR M900 and/or various other products to qualify for the over $50 discounts.
The Rofis TR15 AA/14500 light also has big discounts over $50, but for some non-obvious reason, if you try and order them with anything else, even non-discounted items, the site gives (me, at least) a message that they can’t be combine with anything. Nevertheless, if you buy two of them at the listed price of $33.35 and use the 40% off $50 coupon, you can get them for $20/each.
More Flashlights (and other products with this promotion), including the FiTorch P30R & P30Z, OTR U16 (U18 was also part of this promo, but sold out), Lumintop EDC25, JETBeam E40R, Brinyte B158
In addition, there is another promotion with volume discounts on some other lights (20% off two units or 30% off three) for the JETBeam TH20, FiTorch ER16 & MR35.