If your tank is young go ahead and wait until you can spend some more bucks on a good skimmer. Water changes, light feedings and low bio load in the mean time will probably suffice.
IMO trying to cheap out on a skimmer is almost a complete waist of money. Buying on line is probably a better rout too as your LFS will most likely carry inferior skimmers, i.e, seaclones prizm visajet, at almost a 100 percent mark up or more.
Expect to pay a couple hundred bucks for the real thing but in the long run you wont regret it.