Fauna Marin just came out with a $19.99 icp test. Right now I use icp analysis.com which is $29.99. I do one about every 6 months but for 20 bucks I'll probably do it more often.
You should send it in, I like them because I dose trace elements and I like to see how my levels are.I bought an icp test kit last year and still haven’t sent it in.