shipping extra or included?

You have to be smart about everything. I also keep shipping separate but eat PP fees, part of the cost of doing business. Shop all the shippers. UPS has a flat rate also, great for heavy items. I refunded $20 shipping cost to an eBay buyer because I used Fed-Ex instead of eBay's calculated price. Anything under a pound can be shipped USPS 1st class mail for 2-4 bucks. Freight can be shipped economically by Fastenal. I shipped a complete 8 3/4 A body rear from SC to VA for about $100. I never add anything to shipping costs.