They are 400$ new AND will require the calibrated mic.
I don't see this coming up used very often, but you COULD check Audiogon or USAudioMart, either of which might have one if you're lucky.
At the same time? Check any local Audio Clubs. The membership is always helpful.
IMO? I"d start by investing in Fixing The Room. This is most of what you are hearing, anyway.
And those DIRAC things don't do anything to the room. If you are sitting in a low spot at a certain frequency and DIRAC turns it 'up' than
everybody else will now have it too loud at that point.
Magnepan MG1.6qr HSU Research VTF-2 MK3 2x Parasound A23 Parasound P5 Cambridge Audio DACMagic Plus Sony PS3 x4 @3foot runs of 10ga Belden speaker wire. GRADO SR80e on-ear headphones iMac as music server (2009) Panamax 5510 w/) ISO transformer LG 65" B6 OLED display