The Monument Lettering Center has a number of metal Spacerite alphabets for sale. Sets start at $85 depending on size, rarity, and condition.
Modified Roman, Condensed Roman, Vermarco, and Common Gothic in various sizes.
Also may have Old English, Double Outline, Classic Roman, De Luxe Roman, Special Roman 2, Government, and Uncial Gothic–contact for details.
If you are in need of a Spacerite board for laying out letters, reach out. Production of the boards ceased a number of years ago, but there is potential for having some new boards produced in the near future.