Just wanted to mention that I've found IHerb in the US to be very efficient and inexpensive for supplements. You get $5 off your first order, then loyalty credit for subsequent purchases. Thorne Zinc Picolinate and Thorne Selenometionine cost me £14.30 plus £2 postage from them, compared to £46 on Amazon. I always keep my orders under £15 to avoid customs charges, which can be huge. Not sure IHerb is cheaper for all supplements so worth doing price comparisons for each supplement. Cheapest post option only takes about a week. I don't have any link to this company other than being a satisfied customer.