Cheap Affordable Car Garages?

I have a 2011 model Toyota Vios without bluetooth or aux cord to connect to my phone. I’ve been meaning to get the car to a garage and add an aux cord but I’m afraid of being scammed, since I don’t think its that big a hassle adding the aux port (the car has an aux button and a small block for it but its blocked cause the car was the lowest tier of vios).

Any affordable or recommended car garages or audio services in Chiang Mai? My budget is 2000 baht or lower.

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