We will invoice winning bidders after auction closes. If you are a domestic buyer and paying via Paypal, simply click on the Paypal logo and pay. We are happy to combine. If we can ship all your items in a Priority flat rate envelope, you pay only 5.65 domestic or 17.50 international to most countries. Domestic buyers, we also have the option to mail combined items in a medium flat rate box for 10.80 or a large flat rage box for 14.50. International flat rate boxes are considerably more expensive. Please email for a combined shipping estimate.