We just checked and it seems that Flipkart has all 5 colors of Asha 501 on pre-order. Sweetener is the price which is nearly 700 INR less than official price of 6000 INR. So, you can book one at Flipkart for just Rs 5299 ( $89). Delivery is expected in 1st week of July, which is not very far anyways.
Read more about Asha 501, click below link,