There is a new Ulta coupon for $5 off a $10 purchase valid through 12/24.
Just scroll down a tiny bit on the left to see the coupon link.
Starting Sunday, Ulta has OPI polish priced at 2 for $15. Use your coupon and pay $10 for 2– or $5 each.
That is a great price for OPI!
You can also use this coupon on any other items you might need except the select brands listed here.
And believe it or not, Amazon actually has good prices on OPI as well. I bought the sampler pack of the new Mariah Carey holiday colors not too long ago.