Time Magazine's Top 100 Gadgets of All Time justifiably mentions the old Commodore 64. Although it listed at $595 when it came out, I bought mine - my first computer - for $139 in 1985 or '86, specifically to play Ultima IV, a game I could still argue as the best ever made.
I was also a user of Quantum Link, an early bulletin board that I connected to at 300 bps. That's 0.3 kbps. If you're on a cable or DSL connection today, you're probably at 1000 kbps or more. Anyway, the C-64 had a good sound chip for the time, and you could download these weird synthesized versions of '80s pop songs, which is mostly what I did with it. I probably still have the disk.
Other personal favorites that make the list: