Suspension

Takes about 20 minutes for a pair of them.

Need to know what it would cost for parts and labor

We don't know that information. Most shops need to charge around $100.00 for labor. Anti-sway bar links aren't very expensive. They are typically around $20.00 for the pair.

My mechanic charged me $180. I feel that's way too high

This type of link is really easy to install in just a few minutes, but getting the old ones out can be a challenge if the parts are rusty. Some mechanics use a torch to cut the old ones off because they think that saves time, but then they have to wait for parts to cool down before they can touch them. Some use air-powered cutoff tools, but that takes longer. Some mechanics try to get the sleeves to slide off the bolts, but they might be rusted together. In that case my 20-minute suggestion is just wishful thinking.

Even when this style of link causes trouble, it should not take an hour to change them. What I would suggest is to ask someone at the shop to explain the charges and what was involved. Most shops charge according to a "flat rate guide" which lists every procedure for every car model, year, and option package. That leaves just their hourly labor charge as the only variable. I looked this up and one anti-sway bar link is listed at 0.3 hours and both are listed at 0.4 hours. That means they're allowing only six minutes for the second one. The higher time for the first one is supposed to include driving the vehicle into and out of the shop, and writing up the paperwork. I find those times to be WAY too low, especially if you live where parts underneath get rusty. A half hour for the job would be appropriate. That assumes we're talking about a pair of outer links, not the inner bushings too or parts on the rear.

This style of link is really common and they're used on a lot of different brands and models. A pair will typically cost around $20.00, but if they come from the GM dealer's parts department, expect them to cost a little over $60.00 for the same thing.