At the moment the easiest way to buy Ethereum is to use currency exchange websites.
If you do not want to spend a lot of time searching, you can use: AlfaCashier or NewLine (we are not associated with these services and do not advertise them). In case you want to explore the options yourself and choose the most profitable one, you can start with a convenient catalog of exchange services: BestChange. On this website you can choose the direction of the exchange (what do you have to pay for Ethereum), check the list of exchange services with info like: rates, availability, reserves, reviews, etc..
For those who like to choose themselves, we will place this Google-link: "eth exchangers".