I live in a small town near a "city" of a couple hundred thousand. Here's all the data:
My small town, my first SB, columbian, 32, $300/meet. I clearly went over but I was learning.
City, 22 year-old stripper, $400. Little head got me.
City, 23 year-old who really did need rent money. Drove 80 miles to me, $200.
City, 19 year-old college student, who opened at $700, instantly took my $350 counter.
City, 24 year-old bartender who took my offer of $300.
There have been a few who initially won't, just will NOT, go under $500 or so, but even those erode over time.
I think $200 is often possible, $300 will get you more girls than you have time for. Of course, I have to point out, that with dinner, a hotel, etc, you're into the $400-500 range, and there are a couple of VERY good pros here for that price, but, that's an hourly rate.