Doors for Display Cabinets/Bookshelf

Am planning to construct a built-in display cabinet/bookshelf, by building a frame connected to the rear wall (studs) and then build up the cabinet sides using timber and buy doors.

Would appreciate some leads for a good place in Melbourne to buy the doors. Say a mix of 2 types of doors (solid timber & timber with glass panels), which are cabinet doors, lighter than actual house doors. Sizes of perhaps 2000 h x 450 w for the bottom & 500 h x 450 w for the top portion. The whole cabinet will have between 8 to 10 doors.

Thanks.