Yes. You would purchase them on an exchange and send them to your CoinOS wallet to start zapping.
Personally, I would recommend Strike or River as the exchange.
Discussion
Is it possible to have two wallets, one on primal and another on CoinOS?
I prefer to zap with one wallet but I don’t think Primal would let me use anything that isn’t their wallet.
Yes and no. You can have more than one wallet used for SENDING zaps, because that is set up separately for each client you use. However, you can only have one wallet at a time for RECEIV8NG, because that is set up in your profile, so anyone can zap you, regardless of which client you are using.