In mid-1990s, dial-up access was already common, but its speeds were still low (like 14-28 kbps, 56 kbps only in the late 1990s), and I don't know if there were any popular solutions to share dial-up access across LAN. On the other hand, T1 lines (1.5 Mbps) were already common, but price of those was still too high for small businesses.
What was the most common method of internet access in US for customers who needed more than dial-up, but couldn't (or wouldn't) afford T1 line? I know that ISDN (64K or 128K) is an obvious answer - but how common was ISDN use in real life? I personally don't know anyone who used ISDN in the office back then. I also know that ISDN was actually popular back then in Europe.