Is there sales tax charge in the store?
Not unless you are a Pennsylvania resident. I am sorry my PA folks, but I am doing my best to make this a legit business and because of this I must charge the sales tax.
What kind of shipping do you use?
I ship media mail within the United States when applicable. Mailing items outside the US, I will use whatever the cheapest standard option is unless contacted prior to request priority shipping and pay the excessive costs.