Does Sally sell OPI nail polish? There is one at 40/42 near GameStop (in front of Wal-Mart?) and another near Wal-Mart on Hwy. 70 in Clayton.
CVS usually carries the newest OPI collection. Not a huge selection but they do have the newest colors each season. It's on the first aisle as you walk in the door on the left hand side on those specialty shelves. It is for sale in the nail salons too but more expensive.
Sallys doesn't carry OPI, ULTA does. I know the OP was looking for it yesterday, but throwing what I know out there anyways. If you are looking for good polish and don't want to pay $8 for OPI, Sallys does carry a brand that I really like and it lasts well, "Finger Paints" for about $5/bottle. It stays really well on acrylic and gel nails. On a side note, I like to bring my own polish because alot of times the nail salons thin theirs out to make it last longer, and then it doesn't seem to wear as well.