Honestly, if I were you I would head over to the Big Lots in Burlington Pike, spend 8 bucks on one of their 50 ct C6 strings, bring it home and see if you notice any flicker at all. If you do, take them back. If you don't, go back and clear the shelf...you won't find a better price on LEDs. Especially if you hit them on one of the 20% off everything sales.
Good Luck,
Mike E.