I'll be joing a group of friends to Bali for holiday during Sep & they already booked the flight. I & another 2 of my friends haven't booked the flight yet due to last minutes join in. I been incharge to book the flight for 3 of us, so should I book the flight now or wait for promotion?

Cause I heard that Air-Asia sell their ticket quite cheap during promotion. But it a risk for us if we can't get 3 seats on the same flight. Another I herad was that the promotion flight isn't very cheap as they increase the tax to cover the cost, properly can save around RM50 only compare to normal price. Is that true?

Any 1 with experience on booking with Air-Asia. Please share you thought as I feel very tentions everytimes my friends asking wherter I book the flight ticket already. Thank!