I flew from Krabi to Jakarta with Scoot. I had to buy one extra luggage at the airport because I couldn't do it online. The airlines charged me $1,625 for one 23-kg luggage. I thought this is a mistake but at that time I had no choice so I paid.
I sent an email to their office and was told that is the correct amount. I bought extra luggage before from Jakarta to Toronto, and it cost me $250.