First of all, when searching on Ebay, set the search on worldwide, and lowest price first. If you don't like bidding, put the 'buy now' option on. Use simple keywords: if you want gothic hairpins with skeleton hands, best is to type 'skeleton hand hairclip'. Also, always look at the shipping costs, free shipping is awesome, but look at the time it will take to get to you... If you want something really fast, and are willing to pay a little more, look in your region only.
Note: If you order from China, Hongkong, Japan,... you will have to wait about a month for the items to get to you. I think the price differences make it worth it, but you should keep it in mind.
So, here are some examples of really awesome jewelry that costs about 1€!
The links to the items listest above:
Tassle earrings (2):