You're going to have to pay a Tivo subscription. $12.95 per month and a 1 year commitment or $399 for lifetime service. You'll need an IR cable to control your cable box. You won't be able to change the channel on your cable box while the Tivo is recording.
You could have easily found a used Series 2 with lifetime service for $120. It doesn't make sense to buy a Series 2 without service at any price, unless you are going to use the parts to repair another lifetime S2.
If you want to continue with the series 2, you might as well buy a second used Series 2 with lifetime service since you'll spend more on a 1 year subscription anyway. You can keep this new Series 2 for spare parts.
You could have easily found a used Series 2 with lifetime service for $120. It doesn't make sense to buy a Series 2 without service at any price, unless you are going to use the parts to repair another lifetime S2.
If you want to continue with the series 2, you might as well buy a second used Series 2 with lifetime service since you'll spend more on a 1 year subscription anyway. You can keep this new Series 2 for spare parts.