I love to use salamanders as weapons, but getting the ammo is so difficult. the herbs aren't the hard thing to get, it's the swamp tar. if any one knows of a good spot, other that lumbridge swamps, to collect the tar, i would be eternaly gratefull.

Go into the Lumbridge caves and kill Cave Slimes in the north-west region of the caves. They often drop Swamp tar and you can quickly gather what you need from them. Bring anti-poison potions with you.

The best place to my knowledge is on the ship you take to lunar isle. Go to lunar isle, then get back on the ship and you should find 4 tiny barrels of tar that can have around 1-10 tar each and respawn every 10 seconds or so.