Echelon have dropped their prices for Black Friday. The bike shows as £699.99 on echelons home page however they charge you for the first month of subscription there and £100 delivery so it ends up more expensive than this Argos price.
The Argos deal includes 45 days of the app subscription free so works out better.
Best price for this particular bike but the monthly sub for the native app could be a deal breaker. I would recommend using it with a cheaper alternative app such as peloton digital.