There are certain things that it's okay to cut costs on, such as using macro and base rock. This can also be safer, as you'll have no worries of bad little critters hitching a ride. NEVER skimp on equipment. You don't have to buy top of the line, but a good mid-range priced piece of equipment will work far better than the cheap knock off. A lot of equipment in this hobby falls under the rule of "you get what you pay for".
Using macro rock, making your own sump, these are ways to save. Buying the Chinese no-name skimmer off e-bay, it'll cost you in the end.