How much would I be saving on my electricity bill ?? any store on the net which sell cheap candles?

Not likely. I do not know your eletrical rates, but if you get some smaller cheaper night lights you will get the same illumination levels that you would from candles without the following problems.

1. Fire hazard.
2. Higher level of polution.
3. Soot from teh candles that will deposit around your home.

Night ligths can be as low as 1 or 2 watts at $0.10 per kwh, you will need to have the night light on 24 hrs a day for 41.667 days to 20.83 days (depending on 1 or 2 watts) before it cost even a dime.

How many candles would you go through in 20 days if you burned them 24 hours a day?