http://www.dealmac.com updates deals daily, and they have the lacie external drive listed for $219.00
The lacie drives do use pioneer, but they also use other's drive-mechanisms as well. They do provide a downloaded patch to provide burn support in OS X.
If you don't need it to be external, then you can buy a pioneer dvr-107 drive at
http://www.esbuy.com for $103.00 with free shipping.
This drive is fully supported via 10.3.3 (internally), and is a great drive.