Quit Quilting???!!!!?? No Way! If this is something that a) you enjoy, and b) you are able to do with your disability, don't quit. You can use old clothes that are still in good shape for fabric, or get some good deals at goodwill/thrift shops. You can check out Freecycle. You can let other family members know to buy sewing items/fabric/gadgets for any gift giving occasions. The cost may seem expensive, but quilts provide joy to both the giver and receiver, and usually last for many years. For me, there is immense enjoyment in watching it all "come together", and the end product is always better than I imagined. It would be a shame to give up something you enjoy.
BTW, tell your nephew the 95% for him will be ideal when HE does all the work and pays for the material!