Well if spider gear is goner and no good shops around, then you pretty much looking at new carrier.
Of course you still can try to go to 4x4 shop and ask them if they can rebuild/machine it, but its sort of patch-up.
Or you can buy parts and try to fix it yourself. I think britishpacific.com had spider gears on list at some point.
If not you options are:
You can get truetrac or detroit (thought with your style of driving and stock half-shafts it will be disaster again
) for under 400$. You can get ARB for around 560$. Either one will be stronger option.
If you stranded on cash to do that (being student) - you can try to get used carrier. They are going in range from about 100$ to 400$, depending where you looking.
And yeah running 33" with stock gearing in there is not good idea
Your halfshafts will get all twisty and turny from that. And putting lower gears will not help to preserve stock spider gear from breaking btw. In fact it will happen sooner.