At JG Sales, $1.99 for 1-9 boxes of 50, $1.70 for 10-99 and $1.6 for 100+. This is the 510 load; Federal 22 Long Rifle High Velocity Lightning 40gr Solid Champion bullet 50rd box.
Here's the URL:
http://www.jgsales.com/product_info.php/products_id/5390
Good shootin'! :---