I haven't tried it, but I was SO close to. The only problem, is my cricket consumption has gone up so I've had to look elsewhere for food buying. I actually just spent $53 on food from reptilefood.com. I will say, that if you buy crickets and such offline as opposed to your pet store, the money you save is amazing. I spent $53 on 250 crickets, 1000 supers, and 1000 mealies. To make myself feel better and not think I spent too much, I figured how much that would all cost if I bought it at one of my local pet stores:
-250 crickets: $26.88 (w/o tax) at pet store/ $8.00 at reptilefood.com
-1000 supers: $100 (w/o tax) at pet store/ $15.00 at reptilefood.com
-1000 mealies: $82.50 (w/o tax) at pet store/ $5.25 at reptilefood.com
-Total cost: $209.38 (w/o tax and trust me, tax makes a big deal at this price)
So I saved over $150 buying food online. And that is including the $20 shipping. It's too cold here STILL to do the 2 day stuff, and my babies are running on empty. So I say go ahead and buy online you will save a bundle in the long run. 
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-Kristen
0.10 Leopard Gecko (Buttercup, Beaker, Beauty, Blaze, Bubbles, Blinkers, Squiggles, Sandy, and two new girlies who are nameless at the moment)
1.1 Fat Tail Gecko (Bell and Bowser)
0.1 Deformed Leopard Gecko (Gimpy)
0.2 Leopard Geckos that lives at my boyfriend's house, but whom I still pay for food...lol (Dexter and our blizzard, Starlight!)
0.0.1 Crested Gecko! (Piper, it's kinda unisex right?)
Proud owner and operator of a Powerbook G4! Why use windows, when I can use Panther? It even sounds better.