That's quite the understatement. The Victor-branded version with the AC adapter input is even more difficult to find; as luck would have it, I checked eBay at the right time and won an auction for it. There's more hiss in the analog output than I'd like, but it does work nicely for my Xbox and GCN/Wii games, and I don't need chat mixing for those.
The "receiver with Dolby Headphone/Silent Cinema" approach is probably much better off from a sound quality standpoint, along with being more versatile in terms of what it can power cleanly and digital codec support (DTS especially). I just didn't go that route because A/V receivers are bulky, heavy devices, and I'd have little use for the speaker amp portion besides powering electrostatic energizer/transformer boxes as the poor man's route to a 'stat amp.