The website gunbot.net gives as close to current - real time - updates on a wide variety ammo. It uses web bots on search engines (not covered here).
The site gives the 'who, what and when' - and will alert you on a price.
- Who has the ammo - Sportsman's Guide, Cabellas, SSA, etc
- What type and what quantity packaging additional per cartridge price is given for quick comparisons and user 'alert settings'
- When it was last discovered such as minutes or hour(s) or days "ago"
Unfortunately, it does increase the competition, but you can see who is price gouging and who are really, really, really proud of their ammo.