Power cable for REL sub -- modestly priced


Does anyone have a suggestion for a longer cord for a REL 328 sub? It has a class D amp.
Before you suggest high dollar cords, please know that I'm not a skeptic, but am tapped out for power cords. And, for what it's worth, I had a Pangea AC9 1 meter power cord which I experimented with using my REL. Made zero difference. In fact, in an exchange with REL, they said this: "A while back, REL tested some third party power cords with our subs but did not find a noticeable impact."

So, my question is about a decently made but not pricey brand of extension cord for a REL sub. I'm not looking for Shunyata etc.  Any suggestions? Thanks.
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I've got 2 REL T/9i subs and I'm using 2m power cords by Viborg.  They're selling on Amazon from $45 for 2m.  When I need a longer cable I connect two together with an adapter. 
Hello, 
based on MC’s research and you need a low cost option I agree with djones51. Just grab a good extension cord. I like the idea of the IEC extension cord but I don’t like the guage step down from the factory AWG. REL probably made the 10AWG cable for 20 amp circuit. Usually if you are doing a longer run you should up the AWG of the wire. Home Depot makes extension cords for refrigerators or air conditioners. I would just use the extension cord from the wall to the REL plug. Later when money is freed up you can test some Better PC’s. 
Thanks, all. Here's the response from REL to my question, FYI:

REL: "Thank you for contacting us. You can use an extension cord with your REL subwoofer, though it is important that the extension cord is rated to handle the current draws requires by the subwoofer. The extension cord should at least match the specifications of the stock power cord that is provided with the subwoofer, and these specs are listed below:
- 3 conductor (including earth ground)
- 18 AWG wire
- 300V voltage rating
- 105°C temperature rating."