Hi Huittan,
look into going abroad. - Check out countries like Czech or I think Slovenia is a full JAR member country. Did my first MPA in Czech, IAA had no problem with it. I cannot help you finding the real cheap ones, but I do know there is a L410 TRTO. Also, why not go up for 10 hours in the AN2, should be best craic ever! It is a few kilos over 5700, and even though ist's SEP, it's a MPA!
If you find out more about the Antonov, let me know and I might join you!
IP