They look like oriental goldfish most good pet shops or fish stores will stock them. They tend to make a bit more waste than a normal bog standard golgfish. They can suffer a bit from swim bladder problems and you will need to check on food youd be giving them. They need good filteration or can get red streaks along there fins and tail which can change to fin rot if the water is in bad condition. I have kept these and there very nice looking fish but need a bit more care than a normal goldfish. They can also grow quite big some of them. There very common in tanks in some chinese takeaways ive noticed. Hope i could help. If you like these you may also like the Black moor and Fantail.