WANTED: 15v Linear Power Supply for Caiman SEG/Dorado2

An ex-audio producer, I love music and know a lot about sound... but not too hot on the electronic knowledge behind the gear that improves it!
I thought the Unifive 15v 'Made for Beresford' power supply I was using for my old Caiman 2 was a linear PS that would be suitable to power my new SEG/Dorado 2 combo. But apparently it ISN'T a linear PS, according to Stan, and is not suitable for the Dorado. So I'm looking for a decent second-hand 15v linear PS that WILL be suitable, and won't cost an arm and a leg!!

Don't really want to pay much more than £50 for the privilege, unless it's going to make a stunning difference to my hi-fi sound!
Cheers all, Malc.