You can't buy any sim card in airport, i spent 1 hour searching everywhere.
15eur for sim card in SFR office.
There is no any information on website or in office, but if you put 20eur to balance you will get 1.5Gb data.
To check balance just open macarteweb.sfr.re
To recharge account with vaucher, open macarteweb.sfr.re
To get your mobile number, open macarteweb.sfr.re