You can get the Hub One at any time from plusnet for £99.99 or as suggested recontract and get it free. I recontracted from ADSL to Fibre 40/2 as only £10 a month same as was paying for adsl and they gave me Hub One and waived the postage charge. Can't see many people if any at all paying £99.99 as their are other routers aviliable at that price.
Can't imagine anyone paying £100 for one. Just signing up for another 18 months at £37 would seem stupid when one can start afresh with someone else a lot cheaper and receive their hub.
I'm on a broadband only contract (my parents pay for the line rental), and only pay £19.99 for the up to 76Mb package. While not as cheep as you can for those speeds, it's still pretty good price for broadband only. I don't think is to bad (a lot cheaper than some of the other broadband only providers out there).
They are on Ebay most of the tiem and go for around £35, don't pay £100 for one, mine has been ok so far with no reall issues apart from it refusing to talk to my own Asus router that is! They are very basic and lack a lot server side, not worth £100 of anyones money but £35ish on Ebay yeah.
