look in an asian market, or if you're in an area with a good sized asian community, regular supermarkets may carry it in the ethnic sections. i've seen several brands of eel bbq sauce, from very thin and soy sauce like, to thicker sweeter versions for sale. sorry, i don't remember the brand names.
The way that you wander is the way that you choose. The day that you tarry is the day that you lose.
Sunshine or thunder, a man will always wonder where the fair wind blows.