I ordered my ro/di setup from eBay also, and paid about $130 for it shipped. I bought from eBay because the one I wanted had a 3g tank and faucet included, but it did not include a deionizing filter or a TDS meter so I bought those separately for about $25 each also off of eBay. So for $180 I have tank faucet 6 stage ro/di and input/output inline TDS meter. I think I got a pretty good deal. I also bought a better way to tap my cold water line from lowes, my kit came with a self-piercing tap, but I was told they tend to leak, so I got a T connector and put that in instead. I highly reccomend a tank of you have space, it's nice having about 3G on demand when you need it.