eBay question

Does anyone know how to purchase 2 different items from the same vendor without having to purchase each item separately?
I know there is a way to do it, but every time I try to buy an item, it makes me pay now through pay pal and then I have to pay separate shipping costs for each item....how do you combine items?

thanks!

contact the seller and thell them you want to buy 2 items and combine shipping.