I buy my Persian music from E-world Records, Caltex Records and Amazon has a few. Real Persian music has the 6/8 beat which is becoming more and more rare among the popular dance music, otherwise you get a lot of electronic base and rap and well it's just not that interesting or inspiring. But it would work if you are tagging it on to your Arabic set and expect that people might get up to dance.

You might try searching for Artists to get you more hits. A few of my favorites: Pouya, Omid, Morteza, Leila Forouhar, Said Mohammadi, Andy (he is more a fusion artist but has some nice Persian and Armenian pieces), and Mehrdad Asemani is my absolute favorite. Be careful with some of his music, some his songs have political/social undertones.

I second Mehrdad's Baba Karam, one of my signature pieces. It's modern yet has that distinct Baba Karam flavor, nice and slow 6/8. Will make the Persian crowd go wild, just take your time with it and relish the rhythm and movements. If you know of other pop versions of Baba Karam like Mehrdad's, I'd like to know.
I agree Maqam and other belly dance music vendors do not really have good Persian music selection though you might find some educational/appreciation CDs, but not really suitable for dance. I think it's getting harder and harder to find real (good) Persian dance /pop music, especially new stuff.