Back in the cave man days we used reel to reel tape decks to put our LPs onto.
on the same tact as the $99 record player with USB, there are more upscale LP spinners with the same USB interface.
past reel to reel, a sound card like an M Audio 24/192 has analog inputs and comes with decent software for importing tape, cassettes, or any other analog info. It runs around $165 to $199 NEW.
buc's idea of the time is right on too... it's a labor intensive afair for sure. A fair amount of people are doing just this idea of convertnig LPs to digital these days for routine playback, and twisting up wax for those special times.
Good luck.