How elaborate of a lightsaber are you wanting to go for? In other words, do you want a replica or do you care if it looks like a toy or what? Depending on that, there are different resources available for building or buying your own and varying prices. Take a look on Ebay for "ANH Obi Wan lightsaber" and you will see that there are ligtsabers of all levels of quality and costume accruacy. Pick the one in your price range and let me know. I will try to help you in any way I can to getting saber you want.