Nano brows, also known as nano needling, is a semi-permanent makeup procedure that creates the illusion of fuller, well-shaped eyebrows. The process involves the use of a digital machine with a disposable nano needle to deposit pigment into the skin's surface. The needle is so fine that it can create hair-like strokes that mimic the natural hair in your brows.

The cost of nano brows can vary widely depending on the location, the expertise of the technician, and the specific requirements of the client. On average, you can expect to pay between $200 to $800 per session.

Here are a few places you can consider for nano brows:

1. **New York City**:
- Brow Design International: Located in Manhattan, they are known for their expertise in nano brows.
- EverTrue Microblading Salon: This salon offers a variety of brow services, including nano brows.

2. **Los Angeles**:
- Beverly Hills Permanent Makeup: This salon offers a range of services, including nano brows.
- LA Beauty Skin Center: Known for their aesthetic treatments, they also offer nano brows.

3. **Chicago**:
- Chicago Brow Queen: Specializes in various brow treatments, including nano brows.
- Brows by Lucy: This salon is known for its expertise in semi-permanent makeup, including nano brows.

Remember, it's crucial to do your research and choose a reputable, certified professional to ensure the best results. It's also recommended to have a consultation before the procedure to discuss your expectations and any concerns you may have.

Please note that aftercare is essential for the longevity of nano brows. Avoid direct sunlight, swimming, and heavy workouts for at least a week after the procedure. Also, apply the aftercare cream provided by your technician to help with the healing process.