It's come to my attention that Barricade is not intended as a lubricant (though looking at its components, I'm not sure why not; and at $21/32oz it's well priced).
In any case, although not the same as the L&R stuff, it looks like Break Free CLP and Kano Microil are both about $1/oz, are considered lubricants, and could be good substitutes for the ultrasonic lubrication. Of course, if you think Hoppe's is good enough, then save yourself some money and buy no-name white mineral oil at <$10/32oz.
Following the L&R's instructions you'd place the parts in the oil while applying power. I'd then let them drip dry back into the tank, followed by a wipe off.