Maxxis,
Good question. I suggest you not start negotiating in either type of spa. They will be very uncomfortable with that since LE would likely use that stunt to try and entrap them.
Assuming you are doing a one hour session, I would expect that at suburban spas, you need to pay the door fee plus 40 - 80 depending on how much you enjoy your time. I usually place the tip on her table before we start - but sometimes leave it at the end. If you want to place it out at the start you will always have a couple of minutes when she leaves the room for you to undress - and that is the perfect moment to place it on her table.
Once in a while if you have never been there before and you do not place the tip out at the start, she will hint at the tip a few minutes after she starts the massage. I never talk about it even then. I just place the amount I intend to tip on the table. If she is unhappy with the tip, she will likely make that clear after the fun and she knows you are safe. Within reason I'd try to make her happy, then decide if you want to return at that price. I have never had a girl seem unhappy with the tip I left, so that must be an expected range for tips.
Maybe 2 or 3 times I have had a girl - a few minutes into the massage - ask me how much I plan to tip. I usually say 40 or 60 - depending on how much I sense a connection. She may or may not try to negotiate at that point. Unless I feel certain more than L1 is likely, I stick to one of those amounts. If you find the "hottest girl in the world" you might consider going higher. But keep in mind that more than L1 is highly unlikely at a massage place unless you have prior knoweldge from other guys, or you visit a few times.
Once in a while you can get very lucky at massage salons. Several years ago I had seen a girl 4-5 times and at the end of my session she whispered in my ear, that the next time I visited we could "do everything" (her exact words) if I would tip her 100. She was really pretty, had a neat personality, and I saw he millions (well ...) of times after that. She eventually got married and retired. I still think about her at times.
Hope this is of some help.
Have fun and play safe.
SL