Glad to see you go out and get some buckshot. $7.99 is a bit high, but with ammo availability it is not an insane price.
Do not get the #3 steel shot, it leaves a very nasty superficial wound but does not reliably penetrate enough to be a stopper.
If you can find it the Federal low recoil 2.75" 00 buckshot is a great round......should run you around $4-$6 for a box of 5.