I make my own.

I use trout

To each quart of cold water I add 1/4 cup kosher salt.
Let brine over night
Remove and pat w/towel, place on grates and let air dry 1/2 hour
charcoal pan 1/2 full
water pan 2/3 full
smoke 2-3 hours depending on thicness.
Don't forget to soak the wood chips for at least 1/2 an hour