iCollectPanini.com is doing its part to celebrate Panini America exclusive athlete and NBA legend Kobe Bryant on Mamba Day. In fact, iCollectPanini.com is stretching today's Mamba Day celebration -- honoring the one-year anniversary of Bryant's 60-point performance in his final NBA game -- well into the weekend. While supplies last, fans and collectors can get 24 percent off every in-stock…