Tivo roamio plus including lifetime $500 for customers of 10+ years. YMMV
Base Roamio w/lifetime service $200 for the unit and $200 for the lifetime service
Plus - $400 for the unit and $100 for lifetime service
Pro - $600 for the unit and $100 for lifetime service
The key seems to be that you must have been a TiVo customer for at least 10 years. It might be less, but so far everyone who has had success has been a customer for more than 10.
I called and said that several months ago they had up Romio plus for 500 and wondered if they had anything similar. The first person I called wasn't able to help me so I called back . The second associate put me on hold and said that when my annual renewal expires in December I will have been with TiVo for 10 years so they could offer me a special deal. I got a plus with lifetime for $500 and free shipping.
So if you are a long time TiVo customer it might be worth a shot, again YMMV