I hate to say it, but landraces are mostly overrated. They can be excellent if grown outdoors in their native locations, but indoors they usually just don't do as well as purpose bred hybrids. Most people who think they want to be growing landraces probably "should" be growing good hybrids instead.
The sativa landraces tends to stretch like crazy (some don't stop growing during flowering), usually take a long time to finish (eg over 12 weeks, some go over 16), and many of them will go hermie no matter what you do.
The landrace indicas are a lot more practical indoors, staying short and finishing fast, but they're prone to rot, and a lot of them taste like crap. The Afghan x Skunk hybrids tend to perform better, and most breeders offer versions of these.
If you do want a pure Afghani, or Pakistani line, there are a bunch of them out there:
Cannabiogen has a few: Taskenti, Pakistani Chitral Kush.
Sensi and Seedsman offer versions of Afghan #1, which is a pure indica. I think Rare Dankness has one too, but I forget their name for it.
Sensi also has Hindu #1 and Maple Leaf indica, both of which I think are pure subcontinental indicas. A few others offer versions of Hindu #1.
Medicann's Afghani is supposed to be a pure Mazari Shariff, and there are a couple others who offer versions of this famous line. This one is probably better for making hash (its was bred for hundreds of years to do so), rather than smoking the flowers, but its a good line.
Next Generation Afghani Kush is supposed to be a pure indica.
And I know there are many others.
If you want a good pure indica, but aren't so hung up on genetic origin, check out Williams Wonder in my signature. It may or may really be a "landrace" (probably is, but nobody really knows), but its high yielding, has a nice scent flavor for an indica, and has knock you on your butt potency.