The following CDI unit is priced at 88 Yuan, with a domestic shipping charge of 10 Yuan, equaling a final price of 98 Yuan. At the current exchange rate, 98 Yuan is equal to $15.95 in U.S. dollars (USD).
http://item.taobao.com/item.htm?spm=...id=18041577178
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The TBTrends agent will charge you a 10 percent fee for every item you order. He will order the CDI units, and any other items you wish to buy, and have them delivered to his office. Then he will place all the items you purchased in one package, and quote you a shipping charge from China.
You will be charged approximately $23.60 in shipping for the first 500 grams (1.1 pounds) sent from China. However, you will only be charged approximately $7.38 in shipping for each additional 500 grams (1.1 pounds) shipped from China.
I think 2 CDI units will probably weigh less than 500 grams. Therefore, you could buy 2 CDI units for approximately $60, delivered. If you decide to order other items from Taobao, your shipping charges would be spread out and reduced for each additional item.
Go to Taobao.com and use the search term "zs250gs" to see what other items you might wish to purchase.
http://s.taobao.com/search?q=zs250gs...itemz_20130508
If you need some cables, plastic, sprockets, brake pads, levers, tool kit, et cetera, you will get very good prices.
These items don't weigh much, and won't cost much in additional shipping charges. Also, these small, robust items are not easily damaged in shipping.
Even if you decide only to purchase 2 CDI units, you will still get them for half the price charged by either Alibaba or eBay.
Spud