Use online exchangers. On the BestChange service website, you can choose an online exchanger for exchanging cryptocurrencies. There are over 440 exchangers there. Here https://www.bestchange.com/visa-mastercard-usd-to-ripple.html I found the best rate and conditions for buy ripple. You can exchange any cryptocurrency there
I use Tabtrader. But I don't use it for simple exchange, I just trade cryptocurrencies. Tabtrader price is updated in real time, which helps a lot when trading. Very grateful to the guys for a good platform.