After double checking, I actually paid $99, but the line showing tax reads $0.00. I didn't do anything special to dodge the tax. What I paid is what it defaulted to. I put the items in my cart last night. Maybe that makes some difference.
Lately, I've noticed that some places have started charging state sales tax. The one that depresses me most is SGAmmo because I order most of my ammo from them. Other places don't seem to be charging it yet. I think it depends on the state of residence of the buyer and the vendor.