Least expensive manufactured doors?

I apologize in advance if this has already been covered. My father and I are looking to build our first teardrop, a 5x8. We've decided to go the route of purchasing pre made doors, rather than making our own. I've searched everywhere I can think of, and the least expensive doors I've been able to find are $245 each. This seems like a bit much, as I was planning on our largest expense being the trailer and not the doors. Any advice on where to find a good quality door that won't break the bank?
Thanks for your help!
Thanks for your help!