Power Cord up to $100?

For under $100 as suggested you could go for the Pangea AC9 6ft $99 from Audio Advisor. Generous return/refund policy if you do not care for what you hear. Allow break in time, at least 100 hours.

Which momoblock amps are you getting power cords for?

Melm, The AC9 typically firms things up, but power cord performance varies in different systems.

There are no absolutes with power cord performance.

200 hours should be enough break in time, so I would wait until you reach that point. I would also turn off the Sim for at least a few hours at the end of the break in, and then turn it back on, let it warm up and see what you hear. If the low end is still absent at that point, I'd return it.