The cost to pump out a septic tank can vary depending on your location and the size of your septic tank.
For me a few years ago when I lived in a house that had a septic tank the cost to pump my septic tank was $80.00 which included the septic tank pumping as well as the travel to the house.
I've heard of some people paying as low as $50.00 to as high as $150.00 to pump the septic tank depending on the size.
But that is still not too bad and you only need to pump the septic tank every 5 or 10 years so the cost is not that bad because the septic tank doesn't require being pumped that often.
You can use septic tank chemicals to help breakdown the waste in the septic tank so it doesn't need pumped as often.