Amazon America currently has LEGO Star Wars Tie Fighter on sale for $40.85 (reg.$54.99). Savings work out to be 26% off. Free shipping and no tax for most states.
LEGO X-Wing Starfighter is also on sale for $45.6 (reg.$59.99) which works out to be 24% off. More of their hottest LEGO deals can be found here.