Was looking for a larger set of cards for my old DSLR
Seems like decent pricing. Not the best in class but serves most of the use cases for photography (and some video graphy use cases)
CamelCamelCamel.
Good callout, cancelled
I'm very cautious of all third-party sellers of SanDisk SD cards these days. eBay is awash with fakes charging less than retail price. I've been caught out twice, (given the pricing I assumed they were genuine) but when I went back to the sellers and said that they were fakes, they both immediately refunded me, so at least I wasn't out of pocket. They claimed they didn't know they were fakes but I have my doubts. Note that I'm not suggesting that these SD cards are fake… as the OP pointed out they are slower than the current crop so one would expect a cheaper price.
Then buy it from seller Amazon AU for $40.18 instead. Amazon AU itself should never be selling a counterfeit. And if it is you should be able to get your money back easily. It's under the Other Sellers on Amazon list.
I was just adding that comment when you responded. I totally agree. Anyone wondering about the legitimacy of their SD cards should checkout this clip on YouTube https://www.youtube.com/watch?v=AhDStZ-wYbE
Don't be fooled as this is not purchased from Amazon itself. Bought from a third party seller called SwiftOrder which happens to be trading through the Amazon platform as a marketplace seller. I've never heard of them. Just hope that it's not accidentally a counterfeit.
I notice if you want for peace of mind if you want to actually buy it from seller Amazon AU from their own stock it's a few dollars more at $40.18. That's stock from Amazon Australia itself. Should be guaranteed never to be a counterfeit.