Well one good thing is to try save as much money as possible. I know its hard to do without having to spend so much.
But you can try creating your own money spells yourself. If you know how to write your spells. Its not to hard to do. Just write down the idea of what you want the spell to do. And then just choose your words that fit the spell the best.
Now to gain things, like luck, money or friendship, this should be done on a waxing crescent to full moon phase. While in waxing crescent phase you can use special herbs, or candles what ever you want to do. For money spells, i would use green candles. I might try using a white candle to represent yourself.
If you don't want to create your own spells, there are a few here on the site. Just be careful which ones you do. Some of them are either fake or fluffy made.
I would check under money/luck spells.