Years ago, CBJ in the front seat of my car near the Javits Center in NY, $20.
Cut to earlier this year FS in CR, $80.
But those are outliers.  These days it's mostly $300-$400/hr.

This was around 1990-91. She was young, and cute, and had a really nice body. Didn't look like a crackhead or anything.  

I had a regular last year, for 150 per hour. Young, cute, hot, full GFE.

I can also go to AMPs here and get one hour GFE plus shower and massage for 200.

My local UTR mature provider will come over for a bite to eat and then we'll go out to dinner She'll do a great bbbjcim, I swear mature women are great at this, for $150 and then I'll usually treat her to dinner at a local restaurant.  To be sure it's not nearly as inexpensive as some of these other posts BUT she is a known quantity and she really gets me off.  For about $200 (dinner included in that figure) I can get a great BJ and spend some time at dinner with a really cool lady.  Plus she's usually immediately available whenever the mood strikes.  Add all this all up and it's the best value in the hobby I could ever hope to get.

Back in the early 80s, a friend and I were walking through the parking lot of the old Aladdin and were approached (in her car) by a not unattractive blonde who leaned out the window and offered me a BJ for $20. When I passed, she started dropping the price until her last offer of $5, right now, right here in the car. A great deal that I still passed up for various reasons.

I've seen Quick Visits at $40 around here, but that's not exactly what I would call sex.  I've not tried a QV, but hear that it's more of a quick hand/blow job than anything else.  $200/hr. isn't unusual for FS on BP around here, although I haven't tried any of those either.

I prefer to dip my wick into quality.