I doubt it will be on there. I thought I read a good explanation why at one point, but I can't remember anymore.
As for it being hard to find, I'm not sure why. DVDPriceSearch shows it at 8 different locations priced anywhere between $10 to $15. I think I got mine from Columbia House last year.
Now I just have to get caught up on the show. I just ordered seasons 4 & 5 today, but I've still not found the time to watch season 3 yet.
By the way, here's a decent site dealing with Homicide DVD releases. They don't have any info yet on season 7, but I'm sure they'll post it when they know more. Homicide Video FAQ
To save starting a new thread I'll ask this Homicide: The Movie question in here. Can you still get the 2000 TV movie Homicide: The Movie on DVD, or is it only available with the Mega boxset? I can't find any listings on eBay. I've tried searching for it on the UK and US eBay sites but can't find any listings.
As far as I know, it's been out of print for awhile. I think the only way it's available now is the megaset, and I think that may be getting hard to find as well. The megaset also includes the "Law & Order" crossover episodes that the season sets did not.