Son of Grok has covered this topic. Solving this craving involves rolling up your sleeves and putting things together yourself, but damn is the stuff worth it.

http://www.sonofgrok.com/2009/06/sog-zesty-bbq-zauce/

Or hit up paleodiet.com They have a recipe for blueberry bbq sauce (there's honey in the recipe so modify or keep depending on how hard you are).

How about combining your meat with vegetables that compliment it. Steak with mushrooms is just one thing that comes to mind.. or salmon baked with tomatoes or lemon slices on top.

Another option is to make curry's and things like that with coconut milk.

Perhaps you just need to eat fattier meats. If it's less dry you might not need a sauce after all.

Try other alternatives!

1. Hot sauce! - Find one that has a reasonable ingredient list.
2. Chilean Pebre - there are easy recipes online; but I buy mine at a local grocer.
3. Mustard - I use an organic spicy brown mustard. And sometimes I just make it myself with mustard seeds. It's super easy.

chimichurri sauce is a good substitute (i like it more!)

I've focused more on finding spice rubs for meats rather than sauces.

1) Commercial sauces always seem to be pretty high in sugar.

2) It's easy to imagine a caveman drying some plants in the sun, grinding them with a rock, and rubbing/sprinkling it on their food, so it seems to be more paleo in my mind.

There is a world of interesting spices out there.

If you are near a Portuguese town, ask around where you may buy Piri-Piri sauce. It's the best thing ever, but I may be biased =) I've also seen it for sale online, but I've never bought it there.

Otherwise try this:
2 tablespoons chili paste,
1 tablespoon olive oil,
1 tablespoon lemon juice, (or use two tablespoons lemon juice instead of the olive oil)
salt and pepper.
Optional: 1 tablespoon Worcestershire.

This should keep in the fridge for a looong time in a tightly closed glass jar. Shake well before using.
For asian meats, replace Worcestershire with sesame paste (NOT oil) or even soy sauce. Also good with basil.

You can use it as a marinade or brush on meat as you cook.