The Home Depot carabiners are great, about $0.99/pc. But they're big in size, too much so for alot of EDC-type applications.
I got a nice assortment of utility carabiners (aka "snap rings") from
Harbor Freight & Tool as a stocking-stuffer last year.
Their package comes in a set of 12 carabiners (clearly marked "NOT FOR CLIMBING"), or 4 different sizes (ranging from 2" to 3-1/8"). They're great, and only $4.99 for the set. Here's the link to their
12 PC Snap Ring Fastener Set. This reminds me to order more.
All the same, I think I'm gonna also have to procure some of McGizmo's carabiners for variety...