Where do you go for an oil filter for a furnace?

I NEED AN OIL FILTER FOR A OIL FURNACE. ANYONE KNOWS WHERE TO GET ONE PLEASE LET ME KNOWWhere do you go for an oil filter for a furnace?
I buy mine at a TruValue hardware store. They cost about $8.00 You shoud change it every time you purchase oil.Where do you go for an oil filter for a furnace?
Maybe Home Depot or a store like that. If not there, then you have to try an Heating and A/C place.
You can find them online at www.phoenixairsupply.com you will need the model and serial number off of the oil furnace
Any hardware store, includiing the big home improvement centers. Just make sure you get the right size. Should be stamped or cast into the housing.
Heating and air conditioning supply house. Change it once a year when having the system serviced.