They weren't yet fully committed to it. Half the store was produce and such -- milk, eggs, lettuce, etc, and the other half was rows of TTL parts, memory chips, diodes, capacitors, and resistors. It blew my mind. I bought a 68000 CPU, 128KB of DRAM chips (64Kx1 density back then), a perf board, wirewrap wire and a wrapping tool, EPROMs, sockets, and built my first computer all from parts I bought at that Fry's.
About 60 seconds away from Fry's was Computer Literacy -- a really great bookstore that, as the name implies, had nothing but computer related books. It wasn't 20 copies of "Computers for Dummies" books. The vast majority of inventory were single copies of the most arcane stuff -- all sorts of college level CS textbooks, and you could ask the desk to order just about anything if you knew the title of it.
I sent a lot of money and time in both locations. Silicon Valley felt like a magical place back then.