After that the list gets pretty short, but there is at least one option. You might take a look at the Hilleberg Akto, by a Swedish tent maker that has been in the U.S. market for several years now (www.hilleberg.com). Hilleberg makes lovely tentsvery light and tough. The Akto, designed as a solo year-round tent, weighs in at only two pounds, 12 ounces. Unlike the Bibler it is not free-standing, but that's also why it weighs so littleby asking you to stake the thing out you save a pole, and the ounces that go with it. I'd recommend the Akto highly, even though at $345 it still isn't real cheap either.
Other choices: Marmot makes an affordable solo tent called the Home Alone, which is $179 (www.marmot.com). But, it's more of a three-season tent. Marmot's Eclipse, a solo tent that is being discontinued, actually looks like it would work well in wintery conditions. It's available on closeout at Campmor for $159 (www.campmor.com). And lastly, Exped, another European tent maker, sells what it calls the Solestar ($199; www.exped.com), a solo three-season tent that weighs four pounds, five ounces. There's some mesh in the canopy, but a full-coverage fly offers plenty of weather protection.