Hello sir... The treatment option varies depends on amount of space between your teeth....If the gap is less than 2mm then you can go for composite laminates and veneers....if the gap is more than 2mm then orthodontic  braces treatment is advicible...Braces prices differ depends on the material. For metal braces it costs around 25k to 35k..FOr tooth coloured ceramic braces it cost around 45 k...

It surely depends on area,dentist and clinic.....in aurangabad it cost only 15k-20k....but in Delhi start from 30k or 35k

As per you said the gap is little,so you can go for composite bonding technique or veneers.These are the best options and less time taking .Other option is braces to reduce the gap.