Turbotax is offering cash advances of $250, $500, or $1000, depending on your refund, to customers who qualify. The program is a test, and is only available in 15 states, only available for limited dates, only available for users of Turbotax Online, and you must meet other requirements. If you qualify, you will be offered the option at checkout.
If you don't qualify for the cash advance offer, Turbotax does not offer any other refund loan options.