K&N PS-7021 oil filter, $2.81, K&N PS-1010 Pro-Series Oil Filter, $3.47, K&N PS-7023, $3.71, Amazon

Amazon has K&N PS-7021 oil filter for $2.81. Shipping is free for Prime members or while Subscribe and Save is available.
https://www.amazon.com/PS-7021-Fi…ve&sr=1-17
Amazon has K&N PS-1010 Pro-Series Oil Filter for $3.47. Shipping is free for Prime members or while Subscribe and Save is available.
https://www.amazon.com/PS-1010-Ch…ive&sr=1-1
Amazon has K&N PS-7023 Pro-Series Oil Filter for $3.71. Shipping is free for Prime members or while Subscribe and Save is available.
https://www.amazon.com/PS-7023-Fi…ve&sr=1-21