For $150 having them do it in your drive way or office parking lot, can't beat that! Figure going to buy it yourself and install it yourself is going to eat up two hours of your day, by the time you drive back to the autoparts store and return the core. Even the Autozone special is $80-$90, not $50.

How much is your time worth? If its worth more then $25 an hour, have MB roadside do it. If its worth less then you do it.

I'd only tip them if they go above and beyond. Tips are earned, they shouldn't be expected.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200