Nail Polish Thinner

So I finally decided to invest in some nail polish thinner. For someone who has tons of polishes, you need to get thinner to make your polishes last as long as possible. I choose to get "Beauty Secrets" from Sally Beauty Supply store. It's a 4 fl. oz. bottle that cost $4.29. It may not look like a big bottle but all you need is like 3-4 drops. This bottle is going to last me a long time.