It sounds like the folks at Old Navy Weekly are going to spread out the love a bit. In recent weeks, as soon as they reload the site with new Qs, there's a mad rush and all the good stuff is gone in a matter of minutes. So now, I think they are going to reload the site with smaller amounts of Qs throughout the week, so keep checking back to see if they've added any of the high-value ones!
This week, I think one of the high value Qs can be found by clicking several times on the cotton candy. It's empty right now, but perhaps it will be reloaded soon.
Also, you can get a $5/$25 Q by clicking on the blue pants of the woman by the toddler.
Good luck! Let me know if you find any other good Qs or are able to snag one of the $75 gems.