A-VIDD Electronics, a computer store in Long Beach CA sold almost everything available for the SS-50 computer.
1977 SWTPC Price list (7k PDF)
SWTPC Price List Page 1 (309kb JPG)
SWTPC Price List Page 2 (337kb JPG)
Apple Price List Page 1 (385kb JPC)
Apple Price List Page 2 (231kb JPC)