Food, water, petrol and almost everything in Thailand have went up except salary.
So we can expect commercial sex price to go up. 1800 and 2500 are common. We can't expect the price to be like caveman time forever. You do have a choice to pay for this price or go back hotel and use your faithful right or left hand.
If you still prefer to follow SG ways of up bringing, "want green, want cheap, want big breasts". You can go lumpini, look for those standing on the street. Less than 1k for a shot, depending your neg skill and whether are you a carrot.