When looking for your latest "must have" item(s) don't forget two things. 

         One: To send your latest item to your watched list. 

         Two: Review each seller's "Other item's for sale" or ""Seller's Store".

Why, do these two things?

Answer: 

When you are looking for your latest "must have", let's say your recent search is for baby bibs, you should look through all of the baby bibs and send the ones you are interested in to your watched list.  Then go back later and look at the listings individually.

When you go back to review each of the baby bib items you can make a better decision on whether this particulat listing will meet with your personal guidelines (For example, some people look for an E-bayer with a high number of feedback, that accepts PayPal, ect..). It will also help to prevent impulse buying to review and compare prices.

Now look at the seller's "other items for sale" or "Seller's Store".  You may find other "must have" items that you may want/need.  Most seller's on E-bay will even provide discounted shipping if multiple items are won.  You need to read the seller's listing to see what additional shipping costs would be and do not be afraid to contact the seller regarding shipping for multiple listings.