I recently had a set of PIAA foglamps installed on my 2002 Blazer & 2002 S10.
I was going to tackle the job myself, but I let a shop do it and they only charged me $40 a vehicle and they did a very good professional job.
I drive quite a bit through fog and snow conditions and cannot believe I did not install these lights sooner... What a major difference.
Here is the link to the product webpage along with a pic.