Cable elevators become a nuisance if your system is anywhere near a traffic area or if you have pets or children that will go into that room. For that matter, adults even trip over / knock these down unless you have a flashing neon light mounted next to them.
Having said that, Dekay's suggestion for air suspension would be the best so long as you can keep them away from the wall or support structure. Other than that, a very cheap source for these are available from Farm & Fleet or other stores that have commercial electrical supplies. What you are looking for are ceramic devices marketed at "cable hangers". These come in two sizes. The versions marketed by Audionut and a few others are the equivalent to the larger size. As such, you can probably find these at a lower price for each "support" and save shipping fees. For what they cost to try, it could be worthwhile. Especially if you have a dry house, carpeting and no kids or pets : ) Sean
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