I took up monte's ebay store link and bought there 2-pack oil filter kit.
My local NAPA store is not well stocked, and orders often take a week to get in. I bought the 2-pack oil filter kit on ebay on Friday, and the filters were in my mailbox on Monday morning - that was good service !!
They appear to be as sturdy/well made as the other bendy filters, with possibly an extra few pleats of filter/greater surface area, which I presume is to help compensate for the loss of filtering area from having to make the joint in the middle. In any case, I think they'll do just fine.