1. Southern Cyprus 
Southern Cyprus is an EU member which means you can travel in Schengen Area without visa. The cost of citizenship is 2.5 million euros.
2. United Kingdom
UK gives citizenship to a foreigner who invests 1 million British Pounds to UK within 5 years. Unfortunately, UK is not an EU member anymore, so no visa free travel in the Schengen Area.
3. Dominica
Dominica is a mountainous, small Caribbean island state with tropical rain forests and natural hot springs. Dominica gives citizenship if you invest 100 thousand dollars.
4. Uruguay
Uruguay is the easiest state to obtain citizenship in this list. Uruguay Government doesn't demand any payment nor investment to the country. If you do not have an infectious diseases and if you have a 1200 dollar monthly salary, then Uruguay government gives you a citizenship.
5. Guatemala
Guatemala is full of rainforests, volcanoes, and ancient Mayan sites. It is located Central American country south of Mexico. If you want to get a citizenship from this exotic country, all you have to do is to invest in 50 thousand dollars to the government bonds.
6. Slovakia
EU member state Slovakia requires 1 million euro investment for citizenship.
7. Hong Kong
One of the most capitalist city in the world, major shopping destination, financial center and the major port of Asia asks you to invest around 1 million 260 thousand dollars for citizenship.
8. Grenada
Grenada is a small caribbean island state, which has around 100 thousand citizens, requires only 100 thousand dollar investment for citizenship.
9. Bulgaria
Another recently joined EU member state asks for 500 thousands euro investment for citizenship after residing 1 year in the country.
10. Ireland
Ireland, EU's hot spot for giant tech companies requires 500 thousands dollars for citizenship. However, they do not tell when they will give the citizenship, maybe 2 weeks, maybe 5 years, who knows!
11. Austria
Austria keeps secret how much money they require for citizenship. They offer a different quote for each applicant. In addition to this, they also demand an extraordinary skill or success story from the applicant. So if you become a successful Steemit blogger one day, you may be eligible to apply for asturian citizenship.
12. USA
American government gives citizenship if you invest 1 million dollar to any sector that you would like to or 500 thousand dollar investment to the area chosen by the government. In addition to this, you have to reside 5 years in US.
13. Albania
The Newest member of EU asks for only 200 thousand dollar investment for citizenship. Therefore, it is relatively cheap compared to other EU state.
14. Montenegro
Montenegro is a Balkan country with narrow beaches along its Adriatic coastline, asks for 500 thousand dollars for citizenship.
15. Macedonia
If you invest 400 thousands dollars and hire 10 workers, then you can obtain Macedonian citizenship.
16. Germany
The minimum investment that Germany requests for citizenship is 250 thousand euro.
17. Belgium
In order to become a Belgian citizen you have to live in Belgium at least 3 years, then you can apply for citizenship, and then Belgium government determines how much you have to pay or invest for the citizenship.
18. Canada
If your personal wealth more than 800 thousand dollars and if you invest 400 thousand dollars, than you can obtain a Canadian citizenship.
19. Dominican Republic
Dominican Republic is another caribbean nation known for resorts, beaches and golfing, requests only 100 thousands dollar for citizenship for one person only. If you want to make your family a Dominican republican, then you have to pay 200 thousand dollars total.
21. Malta
Malta is another island state, and a EU member, and it asks for 1.15 million euro investment for citizenship. The qualification period is 1 year.
22. France
France is the hardest country to buy a citizenship in this list and probably around the world. It requests you to invest 10 million euros for citizenship!