A preliminary assessment of the prospects of tritium assisted D-D based fusion-breeders (FB) is performed. For this purpose, the D-T STARFIRE and the Cat-D WILDCAT tokamak designs are converted into FB's. Two tritium sources are considered for T-assistance - the FB blanket (using Li or 3He) and the client fission reactors. The TCD modes of operation, in which the 3He exhausted from the plasma is converted in the blanket into T which is fed back to the plasma, are found most promising of all D-D based FB's. Their profitability is somewhat lower than that of the D-T FB's, but they offer ∼50% higher support ratio and simpler blanket designs. T-assistance from client reactors might significantly improve the economics of FB's.