WORKSHOP Wet Dry Car Vacuum 3 Gallon

Is it hard to get bags for the Wet Dry Vacs WS0301VA Portable Wet Dry Shop Vacuum for Auto, 3 Gallon, 3.5 Peak HP?

This is basically the Ridgid 3050 so the filter should be the same.

http://www.homedepot.com/p/RIDGID-3-gal-Wet-Dry-Vacuum-WD3050/202078667?keyword=Wet+Dry+Car+Vacuum+3+Gallon