Few years ago I was able to buy all I need to survive for 100 ($120) a week (rent not included). Today I at least need 200 ($240), although I mostly buy the same stuff as before. What do you think is the reason and what implication does it have long term?
Go through the items and find the ones that are costing a lot. Then decide if it's worth buying or if it's better to do without/cut down use or go for a cheaper alternative.
I assume you're not counting utilities since it doesn't take much of a mining setup to cost that much to run, although in that case I presume you're getting substantially more out of it.