I use the mini lamb and rice but only buy the smallest bag which I think is about 2 kg as it is not the main food for my two poodles which is tinned natures menu. I fill 2 kongs with the arden grange for them. I buy my AG from a pet shop connected to a garden centre about 7 miles away. I think local pet shops may be willing to order it in for you I know my local pets corner would if I asked them. I pay just under £9.00 for the smallest bag.
I have just ordered online tonight at Berriewoods. They have a fantastic offer on at the moment, and it's free delivery. I ordered 2 x 15kg sacks of Lamb and Rice, and it cost me £52.25 - can't go wrong! I wouldn't bother with the 7.5kg with an offer like that!