i'm sorry. i do think it can be a lovely no-spend christmas, but i also understand the stress and sadness of not being able to give your loved ones whatever you would really like to.
there are tons of projects out there for your felted sweaters! you probably already know that. some other ideas are a letter or poem, a thrifted book with a personal inscription (i've been on both ends of this gift and love it, including when i was a kid and it costs less than $1), a video of family photos with a special sountrack, homemade sweets - or what other supplies do you already have around the house?
can you find tights at the thrift store? i know there is a huge variation depending on where you live; i'm spoiled by awesome thrif stores with good selection and good prices.
do you have anything to get rid of? because raising even $30 would make things a little less stressful. i recently found a ring i was given at my 5-year anniversary employment, from a company i no longer work for. i am not sentimental so i sold it for scrap gold and got $60. other things to possibly sell (on craigslist or in a shop) might be unwanted furniture, electronics, movies or music. another possibility is to see if you can relieve a different area of your budget to free up a little cash, like saving some of your grocery money by getting a box from angel food ministries or something similar. i'm sorry if all these suggestions are things you've already done or don't make sense for you - just thought i'd throw them out there in case they might help.
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