Do you seriously believe that Scott Paper would keep warehouses of TP laying around if only they knew that they could charge $5 a roll if there were a shortage for some reason?

Honestly, large manufacturers/retailers are probably the least likely to price gouge because, laws aside, any extra profit that, say, Home Depot can make by selling snow shovels for $50 before an unexpected early blizzard is 1.) Trivial for their overall bottom line and 2.) Likely to result in a very expensive reputational hit.