Being that the Ford floor van is flat, not recessed like a typical car, I felt the advantage of going with Weather-Tech didn't apply.
Many years ago I found new OEM Ford carpeted floor mats for our 2007 Ford interior color, sold very cheap on eBay. I think I paid around $40 with shipping included. I was worried about soilage, but we've had them for so many years, I am glad to have them. They are very easy to remove and shake-&-hit clean. They remain clean enough and are comfortable on my stocking feet when driving.
If interested, go on eBay and search "Ford E-Series OEM Floor Mats". Maybe you will get lucky like I did and find the color that matches your Ford interior.