Phones are increasingly shipping without microSD card expansion slots, but you can still stick it to the man by getting cheap expandable memory for plenty of devices. Today you can save a few bucks on Transcend microSD cards on Amazon. The 64GB and 128GB varieties are on sale for up to 72% off full retail.
The 32GB card usually sells for around $20 and the 128GB is commonly about $60-70. If you're looking for the better deal, that's the one. 128GB is probably 2-4 more times the storage your phone came with too.
This is part of a larger Transcend flash memory sale on Amazon today, but the other items aren't directly related to mobile devices. If you like, you can also get deals on flash drives, full SD cards, and SSDs. The deals are only good for today.