First, these bags are great.  They are the perfect size for glasses or small electronics (but I have only used them for glasses).  I actually keep the glasses inside this microfiber bag while inside a hard (but unlined) plastic case.  This gives them good protection from scratches and from being crushed.

I ordered this bag(s) from Sun's Out Shades.  This seller advertised 2 bags for the price of $3.75 (free shipping).  I received 12 bags!  Better than a fantastic deal.