What makes you think it is down? What are you experiencing? Is there any kind of error message, or is it simply not listed as one of your payment options?
Is your Federal refund large enough to pay the TurboTax fees plus the additional 39.99 service fee for that option? You will avoid that fee and save 39.99 if you pay your fees upfront with credit/debit card or a prepaid debit card you can buy in a store.