mga sir,

i'm new here, hoping can get ideas and help, my van is 1988 toyota van wagon LE, first time ko rin pong magkasasakyan. i believe the van originated in north america, canada as per on the tag at the engine bay. it's engine is a 4Y-EC. My problem is my oxygen sensor, it needs replacement, but don't know where to buy....any ideas po kung san makakakuha and how much po kaya?