Where to find and how to use NUTS2 level maps in R
There are many opportunities to find maps which are good for R, also you can easily find country level maps.
TIP1: GADM database + basic plot function
For example GADM is an awesome site, you can freely download any country map in a format of SpatialPolygonsDataFrame. Most of the countries has multiple levels.
Here is a simple example: (I will use map of Hungary through the whole example)
Also there is a cool interactive web-based solution thanks to Google (and of course the creators of googleVis package) which also supoorts most of the countries:
TIP3: Eurostat geodata + basic plot function
But it was really hard to find a NUTS2 level country maps for me, but finally I came across the geodata of Eurostat. I recommend to use the 1:1 Million scale if you want to plot countries.
When I used the geodata for my project I also used the cartography package which is an easy-to-use map creator.
Here is a small example how you can use it: