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Problem solved: I looked up how to calculate a coil, and found that I need only 100-200 turns of wire (for 150-300µH) on a 30mm diameter, 60mm long non-conducting (plastic) core. If I use a ferrite core I supposedly only need 50 turns (4x more inductivity). So I just bought 100m of 1.5mm copper wire (gives me 1.75mm² which is good for over 20A current) and will wind my own. For the 20 EUR incl. shipping the wire costs me, I can make 5 coils, whereas I would have only gotten one for that price by ordering it.
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