DIY is the way to go. I just installed winter blades last month from auto zone - and not a minute too soon. Several ice storms already in Chicago this year, and we're getting hammered today. Lots of use out of the heated windshield!
On another related note, does anyone else have problems with the rear blade not contacting the rear window? It seems that the spring in the arm is not strong enough and/or the joint rivet gets corroded. I peridoically move the arm to and from the window to loosen the joint, but it has never seemed to make good solid contact...