You're correct they are part of the rear suspension. Almost every time you touch suspension components, the alignment needs to be checked afterwards. I know some shops won't charge if nothing needed to be adjusted. At least local Les Schwab has such practice.

 

Toe is the biggest thing to worry about with suspension. If your toe is off, your tires will wear much MUCH faster. I'd get an opinion at another shop not a dealership just to see what they say and get a quote. Dealerships aren't known for the cheapest servicing.

 

Wait? an 09 with 12,000 miles!? I just brought my '13 pat in and the dealership is replacing a bunch of rear suspension components under warranty(32k miles). They said my stuff is all corroded too. That makes a whole wiring harness and my rear suspension under warranty, from corrosion...Upper Wisconsin must use depleted uranium as road salt or something

 

I would get it done elsewhere
Parts should be under $100
$388 for labor is outrageous
I paid $350 labor to redo entire back suspension
Upper, lower, lateral and toe links plus front control arm.
For alignment, depending on work, some can eyeball it and get it close to spec