Well, in landraces I am partial to Lebanese, Kerala ganja and Durban Poison myself. RSC has a good Bekaa Valley strain of Lebanese that finishes really early. Blue Hemp in Switzerland had the best Lebanese strain, but they are defunct now. RSC has a good Kerala, but it finishes really late (like New Year's Day). I heard that Cannabiogen has a good Durban Poison. Many Durban Poisons (mostly from Holland) out there are actually the Dutch Durban x Skunk and not real Durban. They are a Durban x indica/skunk cross and have a lot less less wake than bake. Its good for what it is, but its not Durban. In Durban, SA most weed strains are now Swazi genetics as well. Also what is called Colombian Gold '72 was developed in a lab in Europe by a guy that I know there. I am not sure of the genetics that he used, but that is pretty much what is sold as Colombian Gold all over these days.
I have picked up some good landrace strains on this forum in trades myself. I got some Lebanese, Durban, Brazilian, and Malana beans in trade here. Also some heirlooms like skunk, Cali-O, Maui Wowie and some interesting crosses. All for only the cost of shipping beans in trade ($7 USA, $15 to Europe).