My bow is broken, and it needs repairing. I could use Repair Hammers, but I'd rather find a smith who can repair it all the way for cheap. Does anybody know a smith at or near Passwall?

Not in Passwall what I know. Nearest smith should be in New Sheoth, on the other side of the island... Or go back to Bravil. Otherwise you′re on your own I′m afraid