You can get all aluminium or one with synthetic wood. Your best bet would be to find a door shop/supplier in your area.
here is a manufacturer link.
http://www.pemko.com/index.cfm?even...ryId=901&subcategoryId=906&productMaterialId=
I would bet you need to replace the entire jamb. Make sure you flash it properly and install a pan or flash it correctly at the bottom or you will be replacing more than a door in the near future.
This video is the best demonstration of how to properly flash a door i have came across. you may not have the same materials available but you should be able to adapt to what ever product you are using.
here is a manufacturer link.
http://www.pemko.com/index.cfm?even...ryId=901&subcategoryId=906&productMaterialId=
I would bet you need to replace the entire jamb. Make sure you flash it properly and install a pan or flash it correctly at the bottom or you will be replacing more than a door in the near future.
This video is the best demonstration of how to properly flash a door i have came across. you may not have the same materials available but you should be able to adapt to what ever product you are using.