While this is not the all-time lowest price for this game (according to ITAD), this is still a great price for a pretty great game that is still holding up today.
It is often described as a mixture of Crusader Kings and Total War which is a great mix. Also, there is a mod community which offers mods making the AI smarter and hence making the game more difficult etc.
You will easily spend dozens of hours playing this game so you will get very good value for money.
If you are undecided about what to play or have played all the games in your library (really??? ;-)), here is a cheap game that is fun and will keep you busy for quite a while.
Enjoy.
oh my memory, my childhood. when the king and his sons conquered from Scotland to England, to the edges of the Russia, bombard the castles and defeat the bandits… :)