Referring to the PSA test (in the US) - the lab my doctor uses charges $116 retail now, plus the doctor's visit and blood draw fee. Paying retail, that is easily $200. For people on the edge, that is a fortune.
With my insurance's "agreed" price (deductible not met yet this year) the test is $8, the visit and blood draw about $80, so we are looking at ~$90 plus time and transportation.