I cut moderately thick plexiglass, around 8" long, used a heat gun to heat them up and bend them in an "A" shape, shaped a indentation on the top ... and viola you have your diy cable elevators.
I previously diy'ed elevators utilizing porcelain electric fence separators but Ted (at SR) suggested the glaze negatively effects sound quality.
Since I already owned a heat gun, the plexiglass tweak was pretty cheap. I must admit I have been tempted by the Shunyata Dark Field elevators, but now for the price has scared me off. Maybe down the road ... I see the cable co. has elevators on sale. Good luck!