While I'm not a fan of Biscrok and Pedigree in general,there are some other brands available of biscuits depending on country and where you can order.If Zooplus is an option and you would like a very good quality but still affordable lamb biscuit,there is one choice from Zooplus alone.
Happy Dog Nature Croq Snack Lamb & Rice | Great Deals at zooplus! These contain no biproducts or "derivatives",are natural,and are completely safe
They're also very cheap considering the quality,but of all the Zooplus biscuits these are the only good quality biscuits.
When it comes to dog biscuits there are tons of options,but do keep in mind not all are created equal and not all will benefit your hamster in terms of getting significant protein.
A good website to use for hamster products regardless of country is Viovet.Viovet do international shipping,and there are some very nice hamster products you can get from Viovet including treats!