You would need to be more precise as to which area. With this being said, generally speaking.....
Wa.:
TNABoard is ok. US$360-$400 seems to be the average for GFE plus any extras you nego.
Lately there has been a large influx of Latinas (probably the only good to come from Uncle Joe's and that sugarbaby of a VP of his open border policy).
Another group are the "CT" girls and overall looks range from average to pretty decent with a few real lookers thrown in here and there. Service has always been very good. Mainly Hispanic US born girls. Perfect English as well as Spanish. I have seen like a dozen and all have killer bods with few to no tattoos. Quasi agency, girls are mainly part time, so less burned out so to speak.
For higher end there is Tryst, the same as you have in Canada. I never use it in the US.
Finally there is a site called Privatedelights.Ch Can find some gems there, but need to look. Also "PD" has a higher percentage of "managed" girls if that matters. Prices are usually higher than TNA, starting at US$500.
Ca.:
Prices are high. Start at US$500 in Nor Ca. and work there way up for the most part as you go South. Exception is Silicon Valley (the real one). Prices are easily US$700 min to US$1000.
Sac is actually not a bad spot to hobby. Prices are a little lower than SF Bay area and certainly Southern Ca. Many of the girls there are truly independent. Have had many a fun time with those girls.
PD is the main board to use with Tryst being a close second in Ca. in general.
Finally, I mention Vegas:
Never been there myself, don't want to go. But if you are in Vegas, I highly recommend to just gamble at the casino and NOT see anyone from any board, lounge lizard, etc. Way way way to risky.