Hi Pete,
Your post caught my attention, as I can not understand how we have to pay premium ($50+) for a pair of wipers.
Last week i purchased some from SCA, the SCA branded ones. Not cheap at $60 a pair. After a few days i had a major issue with the driver side one where for some reason the blade was flipping and making a big screeching noise when i'd turn them on (and scratched the windscreen). It seems like the rubber on the left side of the arm was getting very soft under the sun (on a few 35+ degree days) and sticking to the windscreen. When i turned the wipers on, the sticking section would lag behind the moving wiper arm and than the arm would pull it and flip it. Long story short, I took it back for a refund to SCA (and they were hesitant to provide a refund at first) as its not the first time i've had a bad experience with the SCA branded products not been of acceptable quality.
But anyway another option i found for wipers is also at Costco. They currently have the Michelin brand and I purchased them a few days ago (for $9.99ea) and fitted them last night. They work well and clean very neatly. As for the quality, its the first time i buy them so I can't really vouch for them, but my two brothers have had those Michelins fitted on their cars for nearly a year now (in Canberra, so they've had to deal with a few icy mornings and now the summer). For $10 (compared to the fancy and expensive Tridons @SCA), I thought it was worth a try!
I think (yet to confirm) that these wipers from Michelin have a refill. But for the $10 bucks it costs, probably worth replacing the whole arm.
I've attached a photo of these.
Cheers.