If he is in the USA or UK, he may be using the Global Shipping Program and cannot combine the listings.
He will have to make a single listing for you, enumerating the items and giving a price for them all at once and the single shipping cost. If he does this, he should put your name as the title.
He can also bill you through Paypal directly, in which case the eBay listing numbers should be in the description.
If the total is under $100 and/or the parcel will not be particularly bulky (smaller than a hardback novel) ask for shipping by USPS. You might still have to pay duty, sales tax and a $10 service fee, but it will be cheaper than multiple packages and cheaper than GSP.