I've been doing this for years.
Need medicine for high cholesterol? Doc prescribes $100-a-month latest whiz-bang pill. Say to doc, "Dude, can't you do better than that?"
Get a $10-a-month pill from Wal-Mart that works just as well.
It's a real eye-opener. Businesses will charge anything as long as the customer doesn't actually have to write a check for it.
EDIT: Since many of you haven't experienced this, I'll share another story.
I tell the doc I have sleep apnea and would like to try a CPAP machine. He says first I need sleep study, which is around $2K. Why? Well because the new insurance guidelines say you should have one. So we talk a bit, and it becomes clear that it's not needed. Cross out $2K.
So he writes a prescription and sends me to a place in town that sells the machines. Cost? $1600. Price for same machine on the net? $350.00
I call the doc back and he faxes the prescription to the internet vendor and Bob's your uncle.
This is about $3500.00 that 99% of everybody else would have had their insurance pay that wasn't strictly necessary.
Negotiating your own healthcare prices is a terrific eye-opener.