Question ASUS RT-AC86U Capping Download Speeds (Ethernet Only), help fixing please.

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Generally the fastest way to get a cable is to buy it from a local shop. Many of the large home improvement stores sell cables.

From what I have seen the cables are about the same price because of the shipping costs for buying single cables.

It lets you look at the cables. Good cables will have marking indicating the wire size and many time will have letters like CU indicating copper. You will most times see the letter EIA/TIA which means they paid to be certified but there have been fake cables from china that put this on their cables.

Most local places since they take returns do not sell junk.