probably refering to my old post:

Another word of advice when visiting Tangkuban Perahu. If you plan to go down to Domas crater, you will have no choice but to get a guide.  According to my driver, the rate should be rp 250,000 per trip but at the entrance the guide will tell you that it is rp250,000 per hour and anything after will be additional charge.  Usually the whole hike down will be abt 2 hrs.  So, you have to bargain for an agreed upon price before continuing down to the crater.  And at the same time , three other guide will follow you down too and will sell you souvenir at the end of the journey.  Politely turn them down if you are not interested.  Their opening price for a souvenir to me was rp450,000 which is absurb.  I told them rp50,000 is all i am willing to pay for 10 keychains.