$80 is for people who cannot turn a wrench. Like... One wrench
honestly though it's not just turning a wrench, and you know it:
0. (once) buy appropriate funnel, collection pan, jack, jack stands, car lift, whatever you're going to use to get under the car that's got 6-7" of clearance
1. buy oil & filter, gloves
2. get car in position and raise it so you can get under it, hopefully you've got a good spot for this, lots of people don't; get oil collection in place
3. "turn a wrench" Like... One wrench, to remove oil drain plug
4. turn another wrench, like, an oil filter wrench, to remove oil filter
5. make a mess, probably
6. wait just a bit
7. "turn a wrench" Like... One wrench, to put the oil drain plug back in place
8. turn another wrench, after putting a bit of oil on the gasket of the oil filter
9. fill car with appropriate amount of oil
10. take the used oil to the recycler
You know, for a lot of people, $80 is worth it. Some people don't have flat ground to work on their cars, or they live in an apartment or otherwise aren't allowed to work on their cars where they live.