Cash advances with Supplemental Security Income (SSI) can be obtained through certain payday lenders or other financial institutions that specialize in short-term loans for individuals receiving government benefits. Some lenders may offer cash advances to SSI recipients, considering the regular SSI payments as a source of income. However, terms, fees, and eligibility criteria can vary widely, so it's essential to carefully review any loan agreement and possibly consult with a financial advisor familiar with your jurisdiction's laws and regulations.