The custom thing have now been made easy. Nowadays they have a chart which lists the size of the tv and the amount you have to pay. i paid around 22,000 for 40' samsung. it varies a little if you have been out of the nepal for >6 months
but the most important thing is that if you take the tv from here, the coaxial jack in nepal does not fit the one you have in US ( i assume u r talking about taking it from US). so you have to take a NTSC to Pal converter jack .But if you have a cable connection which nowadays provides you with a reciever, then you just need a HDMI cable. Otherwise you need a PAL to NTSC digitial tuner , which costs around 130 in amazon.

so do a little bit research before you commit to it.