My car had to be brought into service because of t...

My car had to be brought into service because of the oil service and the car battery warning indicator. Everything was done to my satisfaction as usual. But when I got the invoice, I noticed 2 positions. 1 .: Price of the engine oil BMW 5W-30 Twin-Power Turbo LL-04. 29.25 per liter will be charged without VAT. The same product is available on the Internet from 11.-. Where does this big price difference come from? Can you bring the oil yourself next time?
2nd price of the car battery: This is for an original BMW AGM battery 80AH, 423.63 without VAT. The Internet starts from 200.-. It would also be great if the next time they were informed that the battery had to be replaced and how much it cost. As is well known, money does not grow out of the ground.
I already know that everyone wants to earn something. That's how it should be. But from my point of view these are somewhat overpriced prices.
In general, everything is OK.