DB Systems has used equipment for sale from time to time.  All items are refurbished and tested to new specifications and come with a 1 year factory warranty.  Prices are approximate depending on the state of the unit.

As of A20 the following are available:

DB-6A Stereo amplifier 875
DB-6A-M Mono amplifier, SN 6260962, 875
DB-6A-M Mono amplifier, balanced in and Speakon out. SN: 6110173 925
Pair DB-6A-M+ Mono amplifiers with additional switched Balanced In (XLR) and triple power supply capacitance (126,000 uf). 2300
DB-1B/2A Preamp, 8-1/2" faceplate 720
DB-1B/2A Preamp SN: 1290324, 8-1/2" faceplate, with new gold jacks 770, with new teflon gold jacks 890
DB-2A new, cosmetic imperfections 180
DB-2A Prototype with grey Bud chassis 125
DB-3, 2-way 18dB Butterworth , your choice of one fequency, DB-2A required 350
DB-3, 3 way 18 dB Butterworth your choice of 2 frequencies DB-2A required 488
DB-3, 2 way, Butterworth, 150 Hz, DB-2A required 300
DB-500e  Crossover--special 3 channel crossover with  24 dB L/R low pass (summed all three channels), 12 dB BW high pass, switch for Academy rolloff.  200 + psy
DB-3XL Switchable Crossover Front panel selectable frequencies of
50, 70, 100 and 150 Hz, 18 dB Butterworth slope, level controls on front,
rack mount, internal power supply. Custom built for dealer demos. Spec Sheet   595
DB-4B Pre-Preamp 210