£65 is abit on the expencive side, as you will be buying siblings (Brother/Sister) You would be better off buying just pullets and waiting untill later in the year to buy an unrealated cockerel.Towards autumn there will be people givng cocks away (even PR) ,as they don't want to carry them through the winter
PR are not rare and for that sort of money they would have to be pedigree and well bred. Run of the mill backyard birds should be about £20-£25 each maximum.
Have a look on the web and write down the breed discription and measure the birds by it before you buy them.
Don't get ripped off just because the seller knows more than you do.
PM me if you need any more advice.