If you want to install them yourself (which isn't hard, there's even a project for it), you can get them from Rockauto.com for around $39 per shock. I think I even have a 5% off coupon code if anyone wants it. $327 sounds a little high for Reflexes because many Sears will install them for free if you buy them there.
I purchased mine from a local tire shop for 240 installed. Their was a buy 3 get one free deal. Check out Monroe.com and see what shops are in your area for install. Thats what I did and called around for the best price.
You can do them yourself though. I didn't because of time really. It took them an hour to install. If I did them myself, probably a day.