A "good" price is what you are prepared to pay......the shots are digital so the photographer can delete easy but a deleted picture is worth nuthin so bargain / barter...more you buy cheaper they get.....$5 for one seems to be the usual starting price then you can get a whole heap for around $20 good quality
My avatar is from Lombok, got 5 for a coupla bintangs

but I have surfed with the photog many times.....got a whole heap another time, me and a few mates-good shots- for combined $30 about 50 good photos