No, I currently don't. I try to keep my prices as low as possible which doesn't allow for me to absorb shipping costs.
I always refund shipping overage charges. This usually happens when buying multiple items shipped to the same address. I try to ship everything together when possible to keeping shipping costs low and refund overage charges after shipping.
Items that have shipping included in the price ship via USPS Priority Mail (unless otherwise noted in the listing) and are calculated for 1 item. If buying multiple items shipped to the same address I refund the price for shipping which was calculated into the price of the items ordered.