I forgot to ask for anti-scratch coating when ordering my prescription eyeglasses online last week, does it easily go scraped without anti-scratch coating? And how much do I have to pay for if I want to get anti-scratch coating for my eyeglasses lenses?

You eyeglasses lenses cann't be scraped easily, anti-scratch coating can make you lenses more resistant, and the coating is also very cheap, you can get it in many local glasses shop for just $1 or $2.