They sell for less than $100 (if they sell) with lifetime on eBay. It is not worth paying $99 to sell it for less than that. The only ones getting more than $100 have upgraded hard drives in them. Without lifetime and a stock hard drive (and a broken DVD drive), you can expect to get about $5-15 on eBay unless you get really lucky.
If you don't want to trash it, list it on craigslist or freecycle and let someone pick it up for free.
Roamio Pro (3TB)
Premiere Elite (2TB)
Two TiVo Minis
Left DirecTV 4/15/07. Left TWC 8/8/11. Now on Comcast Xfinity.