I've recently seen Lake City Federal brand 5.56 ammo as low as 33 cents a round.
Plinking ammo in 9mm can commonly be found for around 20 cents a round.
Seems like a good time to buy. Summer's coming up. Make a point to get some range time in.
Only .22 rimfire seems to remain hard to come by and outside the range of traditional price point. Lowest priced I've seen worked out to about eight cents a round (excluding shipping) on special from an online seller, and it sold out quick.