Turbos are so popular today that you can find them all over the place. Even OReilly Auto has an inexpensive Dorman line. The race shops have neat looking braided lines but the automakers use solid steel.
https://www.oreillyauto.com/shop/b/fuel-delivery/turbocharger---supercharger/turbocharger-oil-line/37ad2bed2d4d
Really though, if you have flaring tools you could just buy some steel tube and make your own. It's low pressure, a 45 degree flare should be fine. Good luck.
https://www.oreillyauto.com/detail/c/dorman-oe-solutions/fuel-delivery/turbocharger---supercharger/turbocharger-oil-line/37ad2bed2d4d/dorman-oe-solutions-steel-turbo-oil-line/doe0/625813?pos=7