You can DIY if you have some mechanical skill.
Buy/rent a coolant pressure tester from Autozone or local auto store that rents tools.
Really easy to use. With the car cool, take off rad cap and attach proper connector. Pump it up to proper pressure, a quick search will give you the right psi. While its under pressure look around to find the leak. Obviously radiator area, also turbo has coolant lines, throttle body has coolant lines, heater core lines go from drivers side on the back of the block to the firewall, coolant lines on the bottom of the block that go to oil filter, also the heater core inside the cab/lower portion in the center of the dash. You won't be able to see the core but any leak there will be damp.