Hi Ian,
The easy and probably cheapest way is to simply buy a few 5m extension cables,
and chop off the ends.
Extension cables are hard to come by at the usual electronics
departments of stores but I just bought a 6ft (1.8m) version at a
computer store for around $12. They also had a cheaper brand but the
difference in quality seemed substantial. The cable itself is 20AWG
twisted, plus foil&braid outer shield.
If the OP doesn't want the connectors but just the cable it is usually
less expensive to buy regular USB cables (A/B). Those are widely
available at places such as Walmart.
Regards, Joerg