ive just put together a 40 gal set up on a "starving college student with a girlfriend with no job and 2 dogs budget...." so far ive spent:
tank: priceless (gift)
LR:50lbs x 3.99lb=$199.50
CC:$12.00
Powerheads (3 402's):$45.00
Skimmer (cpr bakpak 2r, used on ----...) $100 shipped
so far thats about $360, add on some misc. stuff (magnet cleaner thingies, net, siphon, stuff like that ~ $45.00) so we'l say $400 before livestock...thank god for ---- and the classifieds....its good if you have friends in this hobby, cause you can share stuff with them too...i havent had to buy test kits or salt...it's shared amongst a group of about 3 of us...as for lighting, im working on that...for now im using some 24" fluorescent housings my girlfriends mom used in her classroom...just changed the bulbs out...this'll do until i save up for some real lighting stuff....as far as a way to save money, do like jakob4001 said and buy all your live rock at once if you can afford the upfront costs...i know it seems like a lot of money, but its cheaper in the long run...i wish i did....