When you buy them, there's the spread and that's considered by many as the fees. As for the transfer, it depends to the exchange or platform where you'll be doing that.
Some may have a bit of fee and some are free to do so but don't you worry, when you withdraw that from any platform, it's not going to cost you that much.
But the problem today is that the mempool is quite clogged and expect a couple of bucks could be the calculation for the transfer fees.