The stamp is absolutely free of charge, but often at Sharm el-Sheikh airport tourists are "bred" to buy or fill out an immigration card for $ 2. But you can fill out this card yourself in a couple of minutes, and not pay anyone anything. There are blank cards at the counters in front of passport control and at the passport control windows (you can go there without a queue and ask for a blank), but be sure to take a pen with you, there are none here.