This infinity scarf from J Jill isn't 100% cashmere (it's a viscose, silk, cashmere blend) but retails for a much lower $49. It also comes in a blue color as well as violet. Click on the photo below to purchase.
Forever 21 has a very inexpensive option (although a darker grey) for $7.80 and you can click on the photo if you're interested in purchasing. It also comes in three other colors.