My answers are based on the Lyman address.
There is an Owens dealer in Columbia. Maybe he has some used boxes or scratch and dent. If you are in KY, there may be one near you but they also make a DIY kit
that may be in your price range
Running Boards, Tool Boxes, Dog Boxes, Commercial Use Products - Owens Products, Inc - Sturgis Michigan
You should also drive over to the new Cabelas and Check out the Rough Tough Dog Kennels which are more in your price range. (if you are in Lyman). For the kind of transport you are describing these should be great. I got an owens welded box (at a much higher price) because my dog may be in his crate all day with short breaks and I did not want to cram him into a transport sized crate but the Rough Tough Kennels are very nice. EDIT-I am sure you can find the best price at some of the gundog supply sites.
Ruff Tough Kennels-Dog Crates, Dog Kennels and Dog Carriers