Power Cord for Audio Refinement Integrated?

I own a relatively new Audio Refinement Complete Alpha integrated amp.

I have noticed, though, that when I tell people this, the first question I am often asked is whether or not I have upgraded the power cable. I have not.

I am naturally interested in gaining additional performance of my unit, but I haven't a lot of additional money.

Have any of you upgraded the power cords on your Audio Refinement/YBA gear? Are you able to recommend a few models that I may try?

I am not sure where I would find such units; the place from where I bought my AR doesn't sell third party cords. Tweeter & Myer Emco (Arlington, VA) don't sell these, either.

Any help would be appreciated.

Thanks,
ivyinvestor