Do you have a batley near you?
If you don't want 60 at a time you can just get as many as you want to suit yourself. It cuts down on the storage space needed.
Having said that, the price isn't much cheaper but they do occaisionally have quite good offers on.
In order to join , you normally need the usual things, an invoice to your 'rescue' name (I cobbled mine together at work so I could print it onto as proper sage invoice) and a letter with your address. They will then probably give you a 60 day pass and all you do is drive up, load what you want onto a trolley or two and go.
They do not accept credit cards, cheques are a pain so cash is always the best option.
and remember to add VAT onto the stuff you buy.