You should be able to buy a switch from Toyota for this. They probably
have a fog light switch available that will fit. I remember buying such
a thing for my old Land Cruiser.

The other option is to use one of the dash knockout slugs and cut it for
a switch. You can buy a lighted switch for under $1 from All Electronics.

"http://www.allelectronics.com/make-a-store/category/720/Switches-Rocker/1.html"

I've done this sort of thing numerous times using a Dremel cutting
wheel. If you're careful, it looks fine, not like a kludge.

I don't know if PIAA has improved, but I have a set of their driving/fog
lights (two bulbs in each housing) on my 4Runner. The relays they
supplied really sucked. They failed after only a few months, and the
replacements they sent also failed. I gave up and used some relays from
All Electronics which have been working for many years.