Cracked Wheel

[jpm4.8is]

Hey everyone!
I found out that one of my rear wheels has a small crack, as the tire loses about 5 to 10 pounds of pressure in about a weeks time. I already had this wheel professionally fixed once (about six months ago), and this time I feel the need to simply replace it. None of the dealerships here in Guatemala carry it, so a special order form the factory in Germany is pretty pricey. I would like to order it online from a US vendor, BMW Wheels : New and Used Factory BMW Wheels and Floor Mats don't seem to carry it...Can you guys suggest an online retailer?
I searched on ebay and found this:
Brand NEW BMW X5 20 inch LA 168 Single Wheel Rim 59487:eBay Motors (item 120337783834 end time Aug-18-09 12:01:05 PDT)
The seller claims that while the wheel is not an OEM item it is made @ the same factory as oem wheels, plus his ebay rating is pretty much perfect...
Any input is greatly appreciated