Is there an active Craigslist in your area? I find lots of good cabinets put up for free, doors included. Many times you can get lots of matching doors from an entire kitchen remodel.
An alternate for DIY with the tools you have is fairly simple. Cut plywood to the size, either your cutting or home center cut to size, glue on ready made molding around the edge to cover the cut edges, hinge and hang. Make them overlap the door frame to cover any slight mismatch of size.