Any good nursery, particularly those specializing in herbs, should carry them or have information on where you can get one.
There are several places on line that I know of, see the related link below:
herb
herb
Green gram plant is a herb.
Tomato is a herb.
shrub
Tomato is a herb.
Yes, the papaya plant is a large tropical herb.
Stem of mustard plant is green and tender so it is a herb
A good online source for buying herb plants is Garden Harvest Supply. They offer many different herbs that are shipped in 3 inch pots.
Mint plant is a herb. It belongs to the family Lamiaceae. Menthol is obtained from this plant.
tomato is absolutly not a herb .It is a shurb
A bay leaf is a herb derived from a shrub of the family Lauraceae.