QB-23 extension cable: $25
Power Cable "MG2" (see below): $23 for the one with the plastic jack; $27 for the one with the metal jack.
Plus actual shipping. % to APUG.
The MG2 cable (duplicates 4xAA) fits the following (according to Quantum site):
Vivitar 283, 5600, 285, 285HV, 636AF, 628AFM, 728 ZOOM, 836AFC
Canon 199A, 299T, 300EZ, 300TL, 420EZ, 430EZ, ML-3
Nikon SB16, Nikon SB15
Minolta 360PX, 4000AF
Sunpak 422D, 433D, 120J, 30DX AUTO, AUTO 266D
Achiever DZ260, TZ250, Albinar 120 MDT TZ, Starblitz 3800DEF, Sakar 730AF, 77TF2, Sigma EF-430
Soligor MK-9A, MK-10A, Quantaray QTB-7500A, QTB-5000AF, QB6500A
National PE-321SW, Promatic FTD 4000, Spiratone TWIN LIGHT
Note that these cables can be used for building your own power packs using lithiums or higher capacity cells (i.e. "D" instead of "AA").