I like the EAS brand. In particular, they have a dark chocolate flavor that's good. The strawberry is synthetic and weird, but in a fun Strawberry Quik sort of way. When my tummy's unhappy, the vanilla is really mellow and still actually tastes good. There's also a generic chocolate fudge.

You can find them in the supermarket, they're like $6 per 4 pack, and you're most likely to see either the Body for Life red package, or the Carb Control silver.

If you get really into them, they have coffee variant ones, which I've only seen online.