Supposedly it's going to get a bluray set at some point soon, but I've been reading that since 2019. In Europe you could already get bluray box sets for, I think, the first 3 seasons. They sold out everywhere though.
The only thing I can still find is Season 1 which got a region-free release.
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However obviously $100 for a totally incomplete show is an issue. Hopefully we'll get the full series sooner or later. Chances are they'll do it to capitalize on the reboot movie's attention. There was some issue with the conversion of the show, though, which is probably why it didn't happen sooner.
I'll say this: I've got the entire HL series on DVD, and the DVD sets are far superior to the streaming version. The streaming version changes the screen ratio to make it widescreen and it ends up cutting off a lot of people's heads. No real gain in quality to offset this either. Just watch it in 4:3 on DVD and be done with it.
Reggie was a bit of a douche and didn't defer to Mac at all like Richie's student/teacher situation. Other than that I definitely think the character filled the same niche. Like "well we can't bring Richie back, let's create an approximation of him". It might even be intended to be fanservice, a reference. I don't know.
There are a few versions of The Source with slight differences, and I'm pretty sure the one I watched did indeed have a Space Baby at the very end. Like a baby materializing in a wall of light before it went to credits. Duncan and Anna were spinning around each other in a light room and then the Space Baby just appears. Like that sex scene in Final Fantasy 6 with the espers.
Side Note: Much like Reggie, Anna would have been a better character if they'd just brought back Anne from the show. ...since she's basically the same exact person, a human woman who wanted to have a normal life / kids with him and couldn't so they walked away from each other. Maybe nobody wanted to return for The Source. Shocked they got Peter Wingfield on considering the self-respect he's got.
Other Note: The Source isn't the only one with a few versions. EVERY mainline Highlander movie did this for some reason. There are a couple versions of HL1. The DVD I have has some rough special effects and you can see cables holding Connor up during the last quickening. The Blu-Ray version cleans up a lot of that. Some versions have extra flashbacks with Connor in WW2 and stuff, some don't. HL2 is the most notorious for different versions. I think it has 2 major versions (theatrical and Renegade) but it might have more IDK. Renegade version removes all references to Zeist. Not sure if the movie is actually good at that point, I haven't seen it yet. Someday I'll watch both HL2s and compare. HL3 has some minor differences, like the VHS version has a longer and hotter version of the sex scene. And finally Endgame has a couple versions with minor differences, mainly pertaining to the ending, as well as a trailer full of scenes that aren't in the actual movie that make it look way better than it is.