I got one as a gift also. Actually, it was meant for my daughter and myself since we both suffer from rhinitic allergy. I don't use it as often since 'di ko gusto yung oil na kasama. The scent's a little too sweet and floral and musky for me. Suggest naman kayo ng nagustuhan nyong amoy and one which helps with your sinus problems.

BTW, I think I saw some refills and the lamps themselves for sale in Shang Mall. I'm not too sure though kung sa True Value ko nakita