To Save on S&H by combining several purchases:

1. Do not pay any invoices you get. Partial payment triggers shipping. Invoices are automatically generated by eBay, and eBay does not know you're trying to combine. The only invoice that matters is the one you get in response to your request for the total.

2. Do your bidding / shopping / thinking for a MAXIMUM of 3 WEEKS. When done, request total by clicking on the REQUEST TOTAL FROM SELLER link at checkout, or in the item drop-down menus.
Do not go over 3 weeks. This is important. At 22 days, you'll get a non-paying bidder notice.

3. DO READ at least one of the end-of-auction emails you get, since they contain information relevant to your transaction and the shipping process. You are responsible for having read that information.

4. No need to email us to tell us you want to combine. There is nothing we do to arrange combined shipping for you. You do it yourself, by following steps 1-3 above. It is a self-serve process.
 

If you do it any other way, you will not get combined shipping savings.