In my area, prices are probably higher than some. The two sitters I know that stay with the animals have a scale something like $25 for overnight - feed animals night and morning. Sitter able to leave during day for a few hours.
or
$35 per day for staying 24 hrs.

I'm not sure what the rate is for just dropping by to feed and play for awhile two times a day.

Just remember - If you pay in rum, don't pay until after you get home