creatine or no creatine it won't help THAT much- for creatine to work (that is- increase intracellular volume) and therefore increase help in lifting- you have to take it for over a month.
Reason being is that it takes time for creatine to enter the muscle and raise it to a significant amount. If you can't afford it in the first place, you won't be taking it for over a month. Like westlock says most weight gainers are protein and sugar.
lets make it ever more truthful- Cheap protein and cheap sugar. Ive been there bro- trying to gain muscle and with companies that try to compete for your buck with crazy and interesting "new research" to gain freakish amounts of muscle (even this site;)- the mostly this site has some good stuff i.e Surge, Flameout, Metabolic Drive).
Don't buy into the scam. Workout- and eat food. The more food you cook yourself the better. Fast food isn't good for building muscle and it can get expensive to dine out at places that serves good food. Workout- eat- get another hobby outside of working out!! - sleep. Repeat.
Hope this helps,