Last time I checked, it was cost effective to buy RTA cabinets and just throw away the unused parts. I had to quote a job and by the time I got and finished unfinished doors, it was cheaper to buy the whole deal and discard the carcase. The place below, at the time I looked, sold cabinets in flat box, delivery included.

Here is a link that might be useful: vendor I used.

I'm pretty certain that conestoga would sell their RTA cabinets with doors deleted. You would still want the faceframe?
Casey

Here is a link that might be useful: Cabinetmaker's Choice (conestoga dealer)

Last time I priced cabinets at the borg, you could delete items, but for some reason, it cost more to have a door deleted than to buy the whole thing.

Last time I checked, the borg doesn't sell Conestoga products.

Casey

I don't remember the brand name, nor did I mean to imply they were Conestoga.