Come2Indonesia are excellent, been using them for years for many flights. Almost instant response and they will hold the tickets for you whilst you get back to them, then just send you a paypal invoice to complete. Minimal add on fee for the lack of hassle is more than worth it. They managed to get me from Bali to Manokwari (Cendrawasih) in one day on a last minute booking, combining 2 airlines and 4 or 5 flights (cant remember exactly). No way I could have sorted that by myself!