I just paid about $118 in struts for my 2006 Chevy Cobalt through apx auto parts. Here's a link. Buy Sensen Front & Rear Shocks Struts for 05-10 Chevrolet Cobalt, Lifetime Warranty | 4214-1288, 4214-1288, 1213-0299, 1213-0299,339084, 339085, 349043, 72179, 5779 Here's the manufacturer's link. SENSEN Shock Absorbers and Struts |SENSEN North America They seem legit. What do you think? I only needed some rear struts but it was more economical to buy the entire set.
I don't have any complaints yet. Outside of some routine maintenance, I'm not much of a diyer. I normally take the car to the shop and that's the end of it. But this time I think I may just try it out. The folks at apx auto parts said they have videos on youtube to help people install the struts. The installation should be simple enough I think.

 

the rear suspension use shocks are a simple bolt in. the front uses struts and you would need a spring compressor to change the struts.