Ordered a diagnostic on my car pre-trip. They want...

Ordered a diagnostic on my car pre-trip. They wanted to charge me $120 for diag and $900 for the following (air filter, cabin air filter, new battery, spark plugs, oil change, coolant flush). The battery miraculously stopped working the day after I got it home, suspicious. Did most of it myself and the coolant somewhere else all for half the price. Never going there again for anything.