Yes, that is a lot of money. Did I hear that there is/are private gifted schools in the San Diego area? If they are, you could check their website or ask them for testers recommendations. In our area there are a few private gifted schools, which I think is one reason testing is not as expensive over here ($350-500)as in many other markets.
Maybe you can get help/referals from this.
http://sandiegomensa.org/resources/gifted-children Another idea some people have explored is to ask the pyschology department of universities.
I am also not clear the reason you want them tested. ARe they already eligible to the program or do they require further testing? Just to clarify, I think there are many valid reasons to want to do IQ tests; but I was not clear from your post what you expect to gain from this.