Can I choose a faster or specific shipping service?
Sure, that can be arranged. Just let me know and I can invoice you for the additional cost....For example: If your item includes free shipping and is scheduled to ship First Class Mail (suppose it's a $2 value) and you would rather it shipped Priority Mail (suppose it's a $5 value), then you would be billed the $3 extra that it costs to upgrade your shipment. I can ship with any service by any of the main carriers (USPS, FedEx, UPS).
Do you charge sales tax?
Only to shipments made to South Carolina. If you are not in the United States, your country may charge you impost/customs fees. You would be completely responsible for these fees.