LG drives available from geeks.com
I know that the few drives suitable for dumping Wii discs can be difficult to find, and potentially pricey if you get into a bidding war for one on ebay.
Computer Geeks has recently received a stock of GDR-8162B and GDR-8163B refurbished drives they're selling for $11.99 + shipping
LG GDR-8163B 16x DVD-ROM IDE Drive (Black) LG GDR-8163B
LG GDR-8162B 16x DVD-ROM IDE Drive (Black) LG GDR-8162B
I do not work for them, but since I live in their back yard - I end up being one of their better customers.