Well, I dunno. I hate to say X or Y is no good because it聮s a $100 sleeping bag versus a $400 sleeping bag. Often, the penalty you pay is in weight (cheaper bags weigh more for same insulation), and in some cases that is no real penalty at all.

Moreover, there are good-quality makers who have excellent quality control, an interest in happy customers, and a willingness to cut costs. Besides, 10 F isn聮t THAT cold!
So here are three I聮d suggest:
声 聮s Snowshoe +0 isn聮t a budget bag, but at $189 it聮s a good buy for a serious cold-weather bag. Its shell is a blend of polyester and nylon, its filling is polyester long-filament, the weight is decent at three pounds, eight ounces.
声 聮s Katahdin Climashield bag ($149) also is rated to 0 F. It聮s similar to The North Face bag聴good-quality insulation, good shell, nice design. Same weight.
声 Most amazingly, 聴a high-end gear maker聴offers a good zero-degree bag for a mere $109. It聮s called The Trestles, and although it weighs nearly five pounds it聮s an excellent, warm bag.
Spend less than $109? I wouldn聮t. C聮mon聴you want to sleep, don聮t you? Just be sure to wear a warm hat as well. And eat a Snickers bar. It聮s a great way to generate some extra heat at bedtime. Plus they taste good.
Want to see more on sleeping bags聴and other winter gear? Check out our annual Winter Buyer Guide.