Looks like it is compatible with the 8500 and 8600 series adapters. The one listed on dell is $50 and says its compatible with 1150:
http://accessories.us.dell.com/sna/p...9&sku=310-3399
I've got a dell laptop and have never been very impressed with their adapters. I've had to buy a new one every 6 - 12 months. The last time that I needed one I bought a Targus. It seems to be a lot higher quality, but I've only had it a few months so I can't really comment on their longevity.