Very sorry - didn't take the time to read it all - I was thinking about the new CRF150R not your F
Yeah then those are called drum brakes and require shoes not pads. Price looks about right from a dealer once converted to US Dollars.
Be sure to clean the drum out with some contact cleaner (don't spray the shoes though), it should be pretty smooth not grooved, if you rode it to long with worn shoes or dirt got in there it might be a bit grooved but should still work OK unless it is really bad.
Good Luck!
The best suggestion - Make sure you have a manual!