YMMV, but try "cart-5849" for 5% off your order (excluding the cost of shipping).
The code works for me, but the discount may be tied to my IP address/user account. Campsaver sent it to me after leaving a fancy down jacket in my cart for several days (they really want my business, apparently). If it does work, it should work on anything, even clearance items. The reason why I know that is because the jacket I left in my cart is Rab's Infinity down jacket, which is currently on clearance for $225 (note: most of the coupons I've seen for Campsaver exclude certain manufacturers, Rab being one of them, and they typically exclude on-sale/clearance items).