Can anyone recommend me some quality tops?

Asking for information about Vegas here is like going to the beach and asking where the sand is.  A search under the word "Vegas" yields 93 pages of inquiries and responses, if you go back enough days in your search.   Even this scene, with its transients, doesn't change as much as all the inquires would have you believe.  Mostly name changes by trannies running away from bad press.

Search that information and you'll have your answer in 10 minutes.

The gals on eros and backpage charge way too much in comparison to girls in Los Angeles, San Francisco and San Diego.  Your best best is to go to the Las Vegas Lounge between midnight and 3AM and take your chances.  You should be able to find an adequate top for no more than $150.  The girls waiting outside charge even less.  Many are drug addicts so I suggest you may want to practice safe sex.

Good luck.