This is not available currently as Indians don't need visa now. So, no VoA available. It's free of cost. Go to immigration counter, show boarding pass and passport and they'll stamp it without question.There are 2 lines, 1 for regular VoA and second for priority VoA. I think they charge about 400-600 TBH. I don't remember, I did that like 6-7 years ago. The only advantage, you get to bypass the line and maybe, maybe not strict immigration checks.