Since you have a censer and charcoal, I can definitely recommend Ancienne Ambience to you. They have lovely incense mixes (resin, herbs) that are amazing. They are more powerful than joss sticks and really re-create the ancient experience of incense in temples.
You might also try church supply stores (esp. Roman Catholic or Greek Orthodox)... maybe you've done that already.
The best incense sticks I've found are by a company called AIRS. Lots of places carry these.
I like the following:
Vetiver, Oakmoss and Sandalwood -- A very soothing, beautiful scent. The sticks themselves smell terrific even before they are lit.
Frankincense & Myrrh -- rich but not sweet. Quite compelling, excellent scent.
Cedar, Sage and Eucalyptus -- very woody, generates a very smoky scent.