my god yes, you can probably almost do that with lr (before fish i'd say 3-400 maybe even less, if you get lucky), if you are resourceful, an shop befor buying,
used 30 gal with lights = ?(20$ up to ?)_
semi economical skimmer 30 - 80 $
sand (use southdown) @10$
if you want lr MO for <150$
salt @20$
and 2 smaller powerheads(maybe 1) 20 to 50$
heater 20$ +/-
I would think that you could very easily achieve those numbers, especially if you get a used tank, or one from walmart with a few extras(ie lighting and hood) for @50 to 80$
ONE GOOD PLACE to look is your lfs's, some of ours have a board where you can buy or sell used equipment and you could be surprised our first 40gal, with stand light hood and 2 filters was only 75 plus he gave us alot of extras like test kits cleaning tools suppliments food and 2 bulk packs of filters and carbon