Since I really love to travel and I know how to do that cheap, I would love to share some travel suppliers that you can use to save money. All of them have free WiFi, tea/coffee, tablets, toilets on board, 220V.
Polskibus
The bus company Polskibus offers a trip for only 1 Polish zloty (less than 1 euro). Without any jokes, 1 year ago I’ve paid 1,5€ for 3!!! tickets (Warsaw-Krakow-Warsaw-Prague).
Beautiful Prague
In addition to the extensive route network in Poland, this bus company also travels to Bratislava, Vienna, Prague, Brno, Budapest, and Berlin.
Buy tickets at the bus company's website - http://polskibus.com/
Simple Express
In the reservation system of the bus company Simple Express, there are lots of cheap tickets in Estonia - only 1 euro per trip - and around Europe. What’s more, the tickets are for 3€ only if buying 6 months in advance. The cheapest ticket I bought was from Vilnius to Tallinn.
Tallinn from the rooftop
Right now the lowest prices you may find are in June and July.
How to buy tickets? Pick up your dates and buy tickets on the site - http://www.simpleexpress.eu/redirect/en/
Onnibus
Finnish low-cost Onnibus offers trips until mid-August: all the first tickets on each travel cost only 1 euro! Excellent opportunity to travel within Finland for a penny :)
Check your dates and buy tickets at the bus company's website - http://www.onnibus.com/en/index.htm
Flixbus
This one I have used the most often in Europe because it has lots of routes all over Europe. To be honest, I’ve never bought tickets for 1€ here, but I think 5€ for a ride from Munich to Berlin was also great!
Great Munich
To check tickets visit their website: https://www.flixbus.com/
A piece of advice - try to buy the tickets online, because they charge 2€ more if buying at their offices. Moreover, they have a certain amount of time on the Internet.
I hope that you liked the article and it will be useful in the future. I sincerely wish you more new trips, adventures, and impressions!