I used to use a Chauvet light timer as a wave timer. It would switch power every 2 minutes I believe. It had 4 outlets but 2 would be on and 2 would be off. At the time, this was cheaper than the true wave timers. They can be found on ebay.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,