Anybody know where i can get this?

I have come across a food that i thought i decided to test vinnie on after seeing it again and remembering feeding the greyhounds on it at the kennels i volunteered at, as his been so fussy lately .. i bought 1 packet to test him, and he never even sniffed it, it gobbled it down and it didn't touch the sides .. gave it him again tonight and he did the same again!.
So i would love to buy him this in bulk, as in PAH you can only buy them individually .. does anybody know where i can buy them in bulk online or in store etc?
Its Called 'Nature Diet'

I use;

www.chemistdirect.co.uk

or

www.petmeds.co.uk

Thankyou =D

Most online pet stores selling them in boxes of 18.

http://www.netpetshop.co.uk/c-512-naturediet-dog-food.aspx