It's really easy to make yourself - then you can control both the sweetness and the intensity of the spice. I did a 2-lb boneless pork loin over the weekend; it's made its way into two soups so far, and I'll be making char siu bao tomorrow,and freezing what's left. Oddly, my recipe comes from a Thai cookbook, but it's the classic Chinese blend of Hoisin, spices (five spice, star anise, gingerroot), soy, and sherry or Sho Xing, with the interesting addition of a bit of fish sauce and some chopped raw garlic, plus a soupcon of sesame oil. I used palm sugar in place of white, just because I have it on hand, and I thought it added a little extra dimension to the sweetness.
One thing: since I didn't want the loin to dry out during roasting, I left it whole, and let it happily marinate in the fridge for 2 days before it saw the oven. Awfully good eats, if I do say so myself. Give it a shot! So easy....drop a note if you want the exact recipe. Once you've done it, you'll know what you might want to adjust for next time. You'll never buy BBQ pork again, I swear.