REI is currently doing 50% off last season items. Plenty of sleeping bags in the mix: https://www.rei.com/c/backpacking-sl...eping-bags%3Bf

The two I would be looking at (I always opt for backpacking, down and 20 or below) would be:

https://www.rei.com/product/216103/b...eping-bag-mens
https://www.rei.com/product/246306/m...eping-bag-mens

There is also a 30 degree version of the first bag: https://www.rei.com/product/216107/b...eping-bag-mens

There are cheaper options.