You will probably find them somewhere on UKW, don't post there much now but used to be as active there as I am here now, only just over 5000posts to look through!!
You can always cut your own veneers from timber reclaimed from your house and stick that to a bit of MDF, these three were done that way with a couple of lengths of cladding off a beam cut very thin

Tried to match this ones with the glass out of the old front door

Or if you want to add insulation the 4 central panels on this one are bandsawn veneers onto marine ply with bandsawn celotex insulation in the middle of the sandwich, moulding applied ontop.

This 2700x 1000 sliding door is a single large press sheet of MDF with assitional strips each side to form teh shaker panels, larger one side to also form the glass rebate. The wardrobe doors you should find my loose tongue method on UKW for how they are made


As does this 7'6" door for the same client reusing glass from a room divider

I usually use Medite Premier as the central panel as its quite light weight and MR MDF for the outer layers as it takes a better finish, structural veneer or bandsawn veneer to the edges and bond in some hardwood blocks below the surface to take the hinges. You can also cut a bit out for the lock before you bond the layers to save having to chop out a mortice.