Speaking of cold, dry places to find meteorites, there are probably few better environments than the surface of Mars! There may not be concentration mechanisms on Mars like glaciers, but it's probably no surprise that each rover has identified a couple of meteorites, and probably missed others along the way...
Heatshield Rock, now an official iron meteorite named Meridiani Planum
Barberton, one of many rocks left as a lag deposits among the sand dunes of Meridiani Planum, and possibly a stony meteorite
Zhong Shan and Allan Hills, probably iron meteorites on Low Ridge in Gusev Crater