Roborovski hamster's?

They have to live together, a duo is better unless your cage is huge( and by huge it is like + 2 feet wide and tall and stuff) all female even though it doesn't really matter, supplies in all are maybe around $50-$60 but if you really care about them maybe $100. Hamster itself is maybe around $15. They are small, so they eat and drink very little so they are cheap to care for. vet bills and vet check ups are usually around $10. They actually don't need any check ups as long as they are heatlhy. I highly recommend petco since petsmart animals are always sick. Also check out the site in my source, its full of info where i got mine from.