Hiya

Burgess Supa Hamster Mix is the food that i have been using for a long time now and i think it is one of the best around, but it can also be quite expensive - some of the others which are a similar price are very good too, such as Harry Hamster. There is also the 'Bunny' hamster food which is highly recommended by people who have used it, but it is very expensive! I have never used it so cannot comment on it personally.
One big problem with Burgess Supa Hamster is that it is now being discontinued and is no longer available, so the ones you see online will be old stock - get them while you can!
Just search online for the cheapest price, but be careful of the postage costs and these can be really high sometimes.
Burgess has replaced this food with a new hamster food called Hamster Harvest (i think that's the name) and i think you can now buy a bag specifically for dwarfs - it looks very good but i havent used it yet, but i suppose i will have to soon if i cant get the Supa mix anymore

Again, try searching online for the best price

Tammy x