The starter is located at front lower left of engine compartment.
You will need to remove the air intake between the front coverplate and the air cleaner housing. Next, remove the hose between the charge air cooler and the electronic throttle module.
Now, you will be able to access the starter to disconnect wiring and then remove starter bolts to remove starter.
Try these on-line resources for the replacement parts: www.autopartswarehouse.com, www.partsgeek.com, www.rockauto.com, www.partstrain.com, www.autoanything.com - to list a few.
For example, they (RockAuto) list the replacement starter motor (remanufactured) from around $104.00 for your vehicle.
Starter motor = AC DELCO part #3362165 - or it's equivalent