Seasons 1-6 available on Blu-ray
As some here I assume already know, the German Amazon has a boxset of Heartland featuring seasons one through six.
https://www.amazon.de/Heartland-Komplettbox-Blu-ray/dp/B00JKAJG1A/
Language: German (DTS HD), English (DTS HD)
Subtitles: German
No English subtitles unfortunately. Still, this is great for someone that wants to own a physical BD edition of Heartland's early seasons though I think these are too on Netflix but that's digital-only among other things (requires internet and a paid subscription).