I only recently discovered these metal cards a couple of years ago. Although I've managed to compile all of the Aluminum Sets produced between 1986-1991, the first two sets produced only in bronze between 1984-1985 have alluded me until today. I found a good deal on the inaugural Gallery of Champions (actually called Gallery of Immortals) set from 1984, leaving me now missing only the 1985 bronze set to complete the series.
Actually, my 1989 Aluminum set was missing the Jose Canseco metal card. I've also managed to complete the Bronze Premiums ('83-'91) and most of the Pewter Bonuses (missing '84, '90, '91).
I have a bunch of extra 1988 Aluminums.