Amazon seems to have ramped up the rate at which they’re sending out invitations to purchase their latest product, the Amazon Echo. If you signed up for an invitation, check your email, or just click this link to see if the Echo is available to purchase for you. Based on a sudden shift in delivery dates, it appears the Echo is suffering from the same unexpected demand as the Fire TV Stick. Orders placed today are receiving estimated delivery dates in late-May, where as orders placed just last week were receiving delivery estimates in March. Let us know in the comments when you placed your order and what estimated delivery date you were given.