Accessories are still available from British Gas (details in the 'Purchasing and Second Hand Systems' sticky thread). Both AlertMe and British Gas are still supporting all existing users' equipment, so if you have a device fail, do still get in touch with them.
This means there are now two actively-promoted AlertMe systems available:
Hive - continues to be thermostat-only for the time being, but is a full AlertMe system underneath.
Iris - the all-singing, all-dancing US version. Which you can buy on eBay for very reasonable prices.
