Discount retailers take center stage on Thursday, August 25. Dollar Tree (DLTR) - Get Report and Dollar General (DG) - Get Report release quarterly earnings before the markets open. Dollar General is expected to report earnings of $1.09 a share on sales of $5.5 billion. Dollar Tree is set to report earnings of $0.73 a share on revenue of $5.09 billion. Tiffany & Co. (TIF) - Get Report , Ulta Salon, Cosmetics and Fragrance (ULTA) - Get Report and Gamestop (GME) - Get Report also release earnings on Thursday. On the economic calendar, weekly jobless claims and July durable goods orders are released at 8:30am Eastern. TheStreet's Scott Gamm reports from Wall Street.