if a provider dosn't post her prices, am I supposed to ask? I'm going to need to know if it's $200 or $1000

Asking someone how much for an hour of their "time" is not illegal. You can also check her profile see what the first review has entered as the cost and you can ask her "is the ter profile correct for an hour" Absolutely under no circumstances ask her how much for a bbbj.

See if she has a web site.  
skb

can't find the info, then check her TER profile for the listed amount.  You can then e-mail and ask if the listed amount is correct?

Remember, you are paying for her time.

Seeing a lovely lady next month on business and wasn't sure how to ask for 1 1/2 or 2 hours as she only posts the 1 hour rate.
Key phrase: "Her time"

the second hour is at the same rate.

You might want to book for one hour, and during that time ask her if she is free to spend an extra hour and how much would that be?

Of course she might have another appointment booked, but you never know.

If you want more than an hour of her time, you shouljd figure on 2X the hourly rate but it would be o to ask what the rate is for the longer time as she 'might' discount it.  What ever she says, you say 'YES' easy as that.  
skb

If the amount is not posted in the ad, ask. There is no harm in asking.