I bought this cactus in Florida. Can you tell me what it is? Some of the buds look like they might be opening to flower.

I'm not great IDing cactus. I'd say it is some kind of Euphorbia, but may be totally wrong.

The buds are pups.
Many species of cactus are known for growing cactus pups, which carry the identical characteristics of the parent.

Yes, a Euphorbia but I don't know which one either.

BTW, technically, its not a cactus. Cactus are an American thing and that is the African version.

euphorbia montrose?

Looks like a hybrid of southern African Euphorbias. Expect tiny unisexual flowers (cyathia). Should be easy to grow from cuttings but avoid touching the milky sap that comes out under pressure when the skin is broken, as it can be a potent irritant. Best form and health with strong light.