XBee module in Mike RIley's book

Hello.

I'm currently reading Mike Riley's "Programming Your Home Automate with Arduino, Android and your Computer" - and I'm not sure which XBee modules and adapter kits its mentioning. When I searched for them - there are tons of them, so I'm wondering which ones to buy?

Just to add one more stupid question - how do you take out the electronic components from old gadgets? Is there a easy way out? Thanks.