Copper bars pretty well have only one use: electrical equipment.
All I can suggest is that you take a look at what you have in terms of size and
straight lengths and take the list to manufacturers in your area who fabricate electrical switchgear. Also, try used electrical equipment places. Some cobble together pieces of switchgear and this can be done with busbars.
Try this
link for a listing of used equipment outfits in Indiana. (I don't think they are all electrical, but their names are suggestive of what they deal in.)
EDIT: By straight lengths I mean what you can get out of a piece that is bent. An end user isn't going to want bent pieces but if you zipcut the straight stuff out of the bends then the material becomes more desirable.
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