Dear Sri C.S.Reddy,
Lemon plants… One of the best variety, very much suitable to our arid area is Balaji, a variety released by Central Acid Lime Research Station, a govt of India research organisation, stationed in Tirupathi. It is canker less and Thorn less, and a high yielding variety.
If you want small , 3 months old plants, they are available ,at times with the said organisation, of course they can give your small quantity.
If you want 2 years old or 3 years old plants, they are available in Devanahalli town, Teja Nursery.
Up to my knowledge , both won’t give door delivery.
As regards to Nelli plants, there is a govt unit on bengaluru-Mysore high way, (unfortunately, i dont have contact details.If you go personally, they will guide you with good information on high yielding, market accepted varieties in Nelli ( hope it is Goosberry, if i am not wrong ). Of course, they may sell you the plants on request, but will not give door delivery.
Melia Dubia… there are so many suppliers, in and around Bengaluru- Mysore.
with best wishes, g.p.rao, farmer