I don't know if any of you ever use online stationery suppliers. I've always tended to use Rymans to fulfill my requirements, but an attempt to sell a load of old comix trade paperbacks on eBay sent me looking round the web for a cheap source of Jiffy Bags. The heavy-duty ones, not those lightweight bubble-wrap lined ones.
Staples UK, who are a spin-off from the mighty US business who named the Staples Centre in Los Angeles (think Lakers basketball and the memorial service for Wacko Jacko), have a good range at pretty good prices. However, they must use blind people to pick their orders, since when I ordered heavy-duty bags, I got mail-misers.
Best just to shut up and take what they give you (like US foreign policy). When you complain, they tell you that they will be in touch shortly, and then don't do what they said they would do. And then when you get in touch again, they ignore you. That's after you spent money on their 0844 numbers. Luckily, I got hold of an unlisted 0800 number. Heh heh heh.
Oh, and if you work for them, you probably found this because you googled 'staples is shit'. And it is.