Ahlusion has been having a lot of sales lately, you might be able to catch one. Put an item in your cart, and if you see a discount automatically applied, then you've hit on a sale. Or check the Ahlusion
thread, people will mention when there's a sale going on.
Ahlusion doesn't have any general-use coupon codes that can be applied at the checkout.
The coupon codes that come in emails can't be transferred to another customer. Your best bet may be to place a small order, wait 3 weeks for the coupon code to come in your email, then place your big order. If you catch one of their sales, your email coupon is stackable with the ongoing sale, so you can get a huge percentage off.