Spacing between cables: They are seriously thin cables, just like normal wire, so i'd make them loop under a speaker (stand) spike, and then literally celotape them down the floor to the amp. This way you can make sure they don't touch each other or other cables. I strongly suspect it makes little difference if they do tho. My interconnects usually touch and i haven't noticed.
Pricing: you order direct from the guy who makes them, pay by paypal. I can't remember the pricing, have a look on the Ordering section. It's about $2 to the £.
At this price it's not a terrible loss if they don't suit your system. I'm not familiar with the Audioquest Indigo, but the Anticable interconnect competes well with my best rca interconnect, the Atlas Voyager. Unfortunately i can't compare to my Nordost Freys or Avid interconnects since they are xlr. Great amp & speakers btw, johnbutler. Are you tempted to upgrade the Arcam to a Leema?
I've got Supra Sword speaker cables (editors choice in WHFC), but not biwired, which i believe the B&Ws appreciate. I may try out the biwired anticables as getting an extra pair of Swords would be at least £500. If the anticables aren't good enough, they can still be a useful upgrade for my second system (benchmarkd dac > primare a30.2 > monitor audio gr10). Any thoughts, anyone?