$34.

I've recently switched to the handheld ones because the seat attachments require you to shift your butt around to catch the stream. Friends seem to be more weirded out by this one though.

https://www.amazon.com/gp/product/B076G9M9JG/

How do you install that though?

Haven't looked in a long time, but I've had this one for almost 10 years with no issues: https://www.amazon.com/gp/product/B00A0RHSJO (only $35).