HTG supply has the least expensive prices I've found thus far. By far. Always order extra hps back-up bulb unless you live where they are readily available.
hey man i was wondering the same thing but i found out that on ebay there is a shit load of hps fixtures that are sumwhat cheap more hps ballast/kits are like in the hundereds but if you go on ebay search HPS bulbs and there should be systems for like 70$ with the bulb pretty good deal good luck man
the cheapest 600w hps system i found on ebay COMPLETE with everything was 220 bucks. I bought one for 114 bucks but there was a typo n it wasnt supposed to come with a ballast. So im makin the dude gimme a 600 watt E digi ballast for an extra 30 bucks. not too bad of a deal. Itll come to a total of 144 bucks plus 30 bucks for S&H