There are no non-active PFC PSUs that I would consider buying today. If you absolutely must though, check out offerings by FSP. Be advised that many of those older models are being advertised at their PEAK rating, not continuous; so a unit they advertise as "400W" may really only be rated for 350W continuous.
If the stepped sine wave is reasonably close, it will still work with many PSUs, although possibly not with the Delta-built Antecs (I had to get a SUA750 for my SG-650). Check with the PSU vendor's tech support or on their forums.