Selected TalkTalk customers and selected Virgin Media customers were part of Plume's entry strategy to the UK market. The TalkTalk offer, but only to selected customers, was a monthly price of £9 for 12 months' Plume membership and included 2 superpods. So, a price of £108 for the year. The Virgin offer was reported as £6/m for a 3 pod pack.
Now that Plume have launched their UK website, you buy direct from Plume. The annual membership (£99) and price for a superpod and 2 power pods is £198 as an inclusive price.
The pre-launch invitational pricing was very attractive but there are no post-launch offers via TalkTalk.
If you think the managed adaptive wi-fi of the Plume system is better than a standard mesh wi-fi approach and better than the router wi-fi and wi-fi extender approach then give it a try. Plume offer a 60 day return policy. NB if you cease the membership after a year the pods are yours to keep but they become passive wi-fi access points. Keep the annual membership going and the warranty on the pods continues as does the managed adaptive wi-fi element.
If you'd like a comparison of mesh wi-fi see Martin's Blog item.