Wandering thru the WalMart this morning when I came across a stack of AC Delco PF48 oil filters for $3.48. These were on the 'auto bargain' shelves with the other auto stuff they are trying to get rid of.
So I grabbed a bunch to stock up - I now have filters enough for now thru the 210,000 mile oil change.
You might want to check the 'bargain bin' next time you are in WalMart.