Where to buy superworms in bulk?

So I'm wondering what sites give good prices (shipping included) on their superworms. I'm sick of buying only 100 at a time for $6.99, when I've seen several places advertise 1000 for $30. My frogs/geckos certainly go through enough of them for me to buy in bulk. So I'd like to see what places you would recommend. Prices? Preferably 1000 for $25 or less..including shipping. I also prefer medium superworms (I realize that Timberline does this, but their prices are a bit much). Any places that you recommend staying AWAY from, as well?