TargetSportsUSA has 20 ga 3" in stock for 17.99/box...also, check your local Walmart as mine in South MS had plenty of them in 20 ga for 19.50ish/box as well as 12 ga (didn't look at price on those).
I looked online and they are all pretty much running $25 a box. I'm just not going to pay that, I will shoot my muzzle loader. I have Remington accutips but have not been impressed with the performance on deer.