Jimmy is right. I got most of mine from Inetvideo but also a few from Amazon.ca. During the format war many people believed HD-DVD was better than Blu-Ray and now many people think that, just like the VHS vs Beta war, it's the lesser format that won.
Some of the reasons for saying that are:
1: HD-DVD specifications are final, Blu-Ray's arent so if you buy a Blu-Ray player now it may not play future movies (I believe this is no longer the case).
2: HD-DVD is not region coded
3: Producing HD-DVD Players and discs is cheaper than Blu-Ray and should therefore be cheaper to buy.
I know many people refuse to buy into an obsolete format but I look at this differently. A movie in HD is a movie in HD regardless of the color of the case, if I can get HD movies for a good price I see no reason not to do it just because they're going out, that's what makes them so cheap.
If one doesn't need a big investment to be able to play them then it's worth it. I already had a separate Blu-Ray player and I've had a computer with a wireless keyboard connected to my HDTV for years. I only needed to replace the DVD player for a HD-DVD one and you can get those on eBay for less than 50$ now.
With shipping & tax my Toshiba player cost me $60 CAD. I bought 21 HD-DVD's, all but two were under 5$, many at only 2.49$, in total it cost me 83$ for all of them. That comes to an average price of 6.81$. There's no way I could have gotten all of those in Blu-Ray at 7$ each, many are still well over 20$.
As for Inetvideo. They use to specialize in OOP and hard to find movies, now they've apparently changed that and became a regular online store which is not to be confused with the store I walk in sometimes. It's the same owners bu they're actually separate businesses, the HD-DVD's are available online but not in the store. They have offices in Canada and the United States and they ship worlwide.
InetVideo For CanadaInetVideo For USA