I don't know if I posted in this thread or another one (BTW, the search function works fine here if you follow the directions in the "sticky" thread at the top of the "General Discussion" section) about the Kelty Cosmic Down 20* sleeping bag. Review. It can be found for under $100 if you shop around. Unlike most inexpensive bags, it is EN13537 rated, so the temp rating (for men/warm sleepers) is fairly accurate. It is, of course, lower quality down and therefore heavier than the high quality down bags we've mentioned here, and it won't last as long. However, it's lighter and will last longer (if properly cared for) than a comparably priced synthetic bag.
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey