With the SD2Vita adapter you can use a MicroSD card as a memory card instead of the Vita memory cards. Your console MUST be on 3.60 firmware and using Henkaku to use this adapter.
Pricing difference example
64gb Vita memory card = $95
64gb MicroSD card = $23
128gb Vita memory card = never made
128gb MicroSD card = $45
256gb Vita memory card = never made
256gb MicroSD card = $126
Here is a video to help guide you through the setup process:
For a full written guide for setting up your SD2Vita on Windows computers, please follow Wololo’s guide.