Tubedude,
Are you asking in reference to buying them as replacement pickups or as a factor in buying a bass with them allready in as original equipmment?
I believe the EMG HZ's were the standard original equipment entry level (for EMG's entry level anyway) on a lot of $300-$600 basses. I have a slightly used EMG soap bar style double coil Humbucker that has a pretty good sound.
I built this fretless bass and originally put in the EMG's because I have always been happy with their sound in good basses but I wanted something closer to a Music Man sound. Then later Seymore Duncan/Bass Lines came out with a Music Man direct replacement upgrade and I put it in instead. It gets a better growl on the fretless with the more piano string like tone the Music Man's are known for.
Anyway I would be willing to sell it fairly cheap if you are looking specifically for a pickup but you may be looking more at buying a certain bass that has the HZ's on it.
The model I have is the EMG DC-45 and I believe I still have the original paper work and an EMG instalation guide book. Again it sounds pretty darn good IMHO and dead quiet but it wasn't THE sound I was after for my fretless. I still have the EMG BCQ on board pre-amp with active bass, treble and sweepable mids intalled on the bass but would like to get the matching Basslines Music Man onboard pre-amp instead. If you are intersted in both I could probably get the other Basslines pre-amp. I had planned on trying to do a trade in with a custom builder/repair guy here in town that built my fretted bass.
If you are interested let me know; otherwise I will stick with plan A