If it's just a mag that fits your existing platform them yeah, I agree, you are kind of limited on options. My 700's were dropped into various chassis that take AICS mags, mostly because I wanted better stocks but also for the AICS mags.
I have a couple of OEM savage 10 round mags, they were $90 a pop which I felt was pretty steep, but I wasn't going to replace the HS stocks as they are pretty decent just for AICS mags, so I get it, just find those mamba mags ridiculous looking and priced lol.
Then again, a plastic 5 round Tikka mag is $100 rip off already, so you Tikka guys are probably use to it.
Other then the Tikka and 783, you can get those LSI mag kits for a little over $100 that include bottom plastic and a 10 round mag, they are made pretty cheap obviously, but I dunno, if I need to convert to mags for a cheap factory stock I'd probably just get the LSI outfits.