asking someone else to solve your financial problem is kinda silly.
airsoft is a pay to play sport... meaning that there's a certain financial burden/investment one has to make in order to effectively play it.
If you can't afford to buy and maintain equipment, then you can't afford it.
Your options are to do some reading to find out if gbb is right for you on your budget, that includes maintenance and cost of replacement parts when things break and what YOUR options are for YOU.
There's tons of maintenance tips for mags on the forums. usually the issue is you drop it on the feed lips or the seals dry out or swell up, causing leaking.