AmmoSeek is a search engine for finding in-stock ammunition, guns, magazines, and reloading components at the best prices fast!
On your first visit to AmmoSeek.com you will be presented with something that looks similar to the screenshots below, depending if you are using a mobile or desktop browser.
Note that in the desktop version there are 4 buttons in the center of the page labeled: Ammo, Reloading, Mags, and Guns. These buttons are how you select between the types of products you wish to search. However, if you just want to search ammunition in your favorite caliber, just start typing it in the search box and matching calibers will be shown automatically in a dropdown for your selection.
In the mobile version (click the SEE MOBILE button to toggle between the versions) the same type selection buttons are located at the bottom of the page, within thumb's reach.