Superbrite list BA9S as a replacement LED for all listed below including 256. Prices start at $0.38 each.
895, 1893, 57, 53, 1816, 1815, 1445, 64111, 1891, 756, 64113, 1892, 3893, 216, 293, 1445LL, 1816LL, 1891LL, 12146, 1893LL, 1895LL, 47830, 17053, 182, 1889, 47835, 3893LL, 53LL, 57X, 57LL, 53X, 1895A, 363, 6253, 3886X, 64115, 256, 257