B&H Photo has the Canon Rebel T1i in stock for both the kit and the body-only. Amazon has it available through third-party retailers. Adorama has the kit in stock and says the body is on its way to the warehouse if you want to get in line. Links below.
B&H Photo – T1i body only
B&H Photo – T1i kit w/ 18-55mm lens
Amazon – T1i body only
Amazon – T1i kit w/ 18-55mm lens
Adorama – T1i body only
Adorama – T1i kit w/18-55mm lens