It’s in season 6, episode 87 ” Let there be light”
this is the upscale perfume place when Carrie describes Alexandr Petrovsky as her ‘lovahh’..
They have weird scents too like “cucumber something” or “cinnamon something”

I believe it is a clothing line, not a store, and the name is “Bitten Sarah Jessica Parker” (No clue why). It was exclusively distributed by Seve & Barry’s, but not sure they’re still around. Check the line’s web site:
http://www.bittensjp.com/
Good Luck!