Since you are in NE, you could contact Scroeder Fur Co out of Grand Island. They have a cat combo that is reasonably priced (a nesting set of 3 traps). They are good traps and depending on where you are at you could pick them up and save on shipping (that tends to be pretty expensive with cage traps)
Also, there is a cage trap builder mercer lawing. his website is
www.cagingbobcats.com Also nice traps.
You can also check out kirk dekalb's traps at
www.advancedtrap.com
Another cage maker is briarpatchcages.com
Another is comstockcustomcage.com
There is a cage maker in Colorado. He is on this forum. i believe his screen name is thinkinthebox. If you search youtube with his screen name, you can find videos of his traps. I believe they are 2 door walk through traps. You could try to contact him through this forum. Not sure of his prices, or if he sells them even or just makes for his own use.
Most of the above makers will probably tell you that width on the traps is not as important as height. Length tends to be about 36 inches for most makers (double doors are probably longer) Width of around 12 inches, or even a little less seems standard. Height of 17, 18 inches or so and up is probably good.
Like I said, if you research all the above traps, you will probably lean towards Shroeder Fur, since I think for your money you can get more traps. Not sure where you are in NE, but could be very convenient for you.