I would also recommend getting a card with at least 16GB storage as more space increases the longevity of the card by having more space for wear levelling. Only the more expensive microSD cards come with wear levelling, which means that the card will try to spread wear out over the whole disk instead of writing and reading the same spot on the disk all the time. If you want to increase the longevity of the memory card, I recommend getting a separate microSD card that comes with wear levelling.
You can get a standard microSD card with many Raspberry Pi 3 bundles, but they may be low quality and do not necessarily last very long. When I got my first Raspberry Pi Model B, I tested 3 cards before I found one that worked properly with the operating system.
Please note that many users report issues with various memory cards, so be sure to get a supported SD card.
