Ammo for sale online has definitely increased in availability and (to some degree depending on the caliber) decreased in price.
For many people that is the only way they are going to get it.
As someone who has done his share of ordering ammo online (dammit I have access to a free range & I like to practice!) I figure that the federales love this current situation. NSA and DHS are tracking all of our credit card use. What better way to track who buys ammo?
I know a retired military guy that does his own reloading. ATF paid him a visit in person at his home demanding that he justify his purchases. To the best of my knowledge he is not using an unusual amount of anything. However, he is a retired vet, and we know where DHS ranks them. A lot higher than welfare collecting Muslims in Boston apparently.
The federales have to love the brick & mortar shortage because you can pay cash there.
Could be because re-loading for personal use is fine, but re-loading to sell is something the ATF is very interested in. You have to have a license and pay taxes on that.