Call me lucky, but I have yet to have anything but speedy service from most internet ammunition vendors. I believe the most sluggish shipping was from The Sportsman's Guide at a little over two weeks. However, most places will have the goods ordered on Monday on your doorstep by Friday, in my experience.
The last two orders from Natchez have yielded some seemingly supernatural Netflix-speed shipping where both packages were received within two days. The last shipment I placed was on a Thursday morning and received it the following day in the evening, this with standard shipping fees. That I can get used to.