well if your looking for momentary switches, you can salvage them out of almost anything, but I would go for a older keyboard first. Some of them used pushbuttons that could be unsoldered
HD44780 displays are tough to come by in anything household, but they can be purchased for less than $20 on ebay or most online electronic surplus places
as far as the power supply goes I really would just spend the money on a inverter or a DC power supply, building them can be a PITA



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