You sound a lot like me. Frugal in terms of housing, utilities, transportation, etc. but low-income. I'm a grad student too.
I think the biggest challenge of living low-income is realizing that you have all these ideals abut you can't afford to spend money on them all. You can't shop at the fair trade/local/organic/artisan AND go to the co-op/Trader Joes AND go out with friends regularly AND have a nice bike AND take yoga classes regularly AND foster pets AND be a bridesmaid for all your friends AND have nice clothes.
You can do some of those things on your budget, for sure. But you can't do them all, not on your income. At some point you have to prioritize the things that are MOST important to you. Alternatively, you can try to justify all your expenses and take out loans, but that's not really living frugally.
This sucks to hear, I know, because I'm very similar to you and could easily have almost identical expenses. I've recently started cutting back on things I'd *like* to spend money on but just can't afford right now without taking out loans, which I'm not willing to do. Some changes I've made, in case you're interested:
- Food prioritizing. I buy animal products that are ethically raised by local farms, and free of added hormones. But that means that I eat more (whole) grains as cheap filler food and some non-organic produce. I buy much of my produce from local farmers in the spring/summer/fall when it's cheap but in the winter I go to the regular store, I only buy bulk from the coop but I price compare with the regular grocer first. It's not as eco-chic but ultimately it's cheaper and not much different from what you'd get at Trader Joe's. (Side note, but do some research on Trader Joe's practices. While they have some good natural food, I wouldn't exactly call them sustainable, they're notorious for being wasteful. Much of the highly-advertised natural foods brands aren't all that sustainable actually, a lot of it is marketing. Be skeptical of companies that make big claims.)
- If you aren't eating seasonally (or semi-seasonally) that's something to consider- it's both cheaper and more eco-friendly to eat seasonal produce.
- Feeding others. I'd love to host parties and feed all my friends but it isn't in the budget. So we have potluck parties where I ask them to bring their own side dishes, desserts, and/or drinks. Everyone still has a good time, I still get to feed people, and it's loads cheaper.
- Mixing yoga classes with yoga videos and at-home practice. I can't afford $50 a month for yoga classes, so I buy cheap videos from yogadownload.com and go to classes sparingly. Same with most fitness stuff actually.
-DIY. Join a bike co-op for cheap parts and learn to fix your own bike instead of paying someone else to do it, that'll save you loads AND you'll feel more connected and knowledgeable about your transportation. Learn to DIY shoe/clothing repair, bake your own bread, grow some veggies in plants, etc. Most things you do yourself should be cheaper than paying someone else to do it.
Just some ideas, feel free to adopt all or none. Basically, those are all ways I've learned to prioritize my spending to account for some of my ideals while still living within my pitiful grad school budget (without loans).