I've heard good things about http://shop.ciseco.co.uk/erf-0-1-pin-spaced-radio-module/ - it works using serial comms, so you can actually program Espruino over it. Personally I haven't used it though, and I'm not sure if it does multipoint.
Otherwise there's http://www.espruino.com/433Mhz - which is very basic (and one-way). You'd have to make all your own transmitter/receiver code for it though, which could be hard to get right.
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