What are the best bubbler mailers for blus?

[wickerjay]

For about a year now, I've been "recycling" my bubble mailers (i.e., re-shipping). I've seen many different brands and styles come across my desk. Some have worked better than others, but I've never bothered to note the brands or dimensions. I'm now in the market to actually buy some but don't know what would be the best instead "making do" with what gets shipped to me.

Here's what I need:
Size: large enough to fit 2 BD titles w/ slipcovers (rarely ship more than that at a time)
Weight: Lowest possible while still providing adequate protection (~0.5oz or less)
Amount: depends on the total and unit price (but I don't need 100s of them)

Other questions:
Best B&M store to purchase them?
Best online store to purchase them?

Thank you for your help.