There is some confusion over the DVDs available, so I thought perhaps a thread where we can link in each countries release, along with a list of episodes.
As far as I know, so far, all releases have every episode in the same order, just broken up into different groups (I hesitate to call them "Seasons".
I'll list them by episode number
3 DVD releases, 1 Blu Ray
V1 contains episodes 1-13
Episodes 45-62 (and 63-75) are yet to be released.
4 DVD releases:
V1 - 1-13
V2 - 14-22
V3 - 23-38
V4 - 39-51
Episodes 52-62 (63-75) are yet to be released.
Only 1 DVD release so far, containing episodes 1-13.
I would suggest sticking to either the Us or Canadian release schedule, rather than swapping between them, to avoid duplicating episodes. I'd imagine that by the end, all 75 episodes will be out in each countries pack, just split differently :)
Also of note is this forum information on how to unlock your DVD player.
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