Old Navy has plush tops (my favorite!) for only $10, flannel or fleece PJ pants for $8, thermal tops for $8, and much more! (commissioned link)

Plush tops — https://shopstyle.it/l/bp8q0
Flannel PJ pants — https://rstyle.me/+YTftFrwPW2_APsTpZEtyOw
Fleece PJ pants — https://shopstyle.it/l/bp8q1
Thermal tops — https://shopstyle.it/l/bp8oq
Full lounge sale — https://shopstyle.it/l/bp8os