Where to salvage inductors?
If I don't find one, I can wind my own.
  Is there another place where I can get even a core or something besides a PSU? 


For high power use a custom designed powdered iron core is usually superior to ferrite. 

As well as power supplies, modern "PC" motherboards often have on board buck converters that provide the high current at very low voltages required by modern CPUs. The cores used are liable to be optimised for high frequency smps use but as they operate at high frequencies (100's of kHz+ ) and high current their inductance is liable to be low. Rewindability will depend on construction but some will be able to be rewound. 

As well as PC type main power supplies there are a vast number of other power supplies available that have cores that may suit. Laptop power supplies are typically rate in the 50 - 100 Watt range with cores liable to be suitable. Even dead supplies are unlikely to have damaged inductor cores. 

Modern "CFL" light bulbs contain high frequency inverters with potentially useful cores. If you have several dead bulbs of the same type you may be able to combine several cores to make a larger effective one.

"Electronic ballasts" for halogen and LED lighting are usually mains to 12V or other inverters with cores of possible use.

12V and 24V DC to mains AC inverters tend to cost little and die young and are a potential source of possible cores. 

Printers, copiers and commercial electronic equipment of many sorts often liable to have substantial internal power supplies. [Finding a dead one is liable to be preferred to attacking the office copier :-). ]