I owned a 48k model, from Jan. '84 to May '85 (sold so I could concentrate on my 'O' Levels!), and it's games have definitely left a big impression on me, probably more so than any other gaming machine I've owned. Only the early arcade shooters have been more influential.
Anyway, I still game via the wonderful Spectaculator emulator on my PC. Most of the (thousands) of games are available legally from World of Spectrum, although I mainly concentrate on the ones that were available during my Speccy ownership time.
Ones I like to play now:-
3D Deathchase Knight Lore (NB good luck finding the Ultimate games. Distribution denied, unfortunately......) Cookie (should have been made into an arcade game) Sabre Wulf Manic Miner Chuckie Egg Football Manager (the emulator allows you to speed games up. Handy in this case) The Level 9 text adventures
The Ultimate Play the Game tape files for Spectaculator (and other Spectrum emulators, but that's the best one by miles) used to be available in a single file but the site is now defunct. Those games are 'denied distribution' now. Manic Miner is already embedded in Spectaculator.
Nearly everything else is available from World of Spectrum, though. You can play text adventures till you drop dead, lol.
I bought a cd from woolworths or pc world aeons ago, which came with the zx32 emulator (runs better than spectaculator on this vista machine).. was surprised it came with a full compact disc worth of games, thousands to try out. Not sure if any high st stores will still sell emulator discs. Favourite games include bak2skool, chuckie egg and fantasy world dizzy :) for buying emulator discs, youre probably best to try ebay, although distinguishing retail emulators/games from gamers simply selling their own private downloaded game rom collections for profit may be difficult