The PSP uses Memory Stick PRO Duo (not standard SD or "Memory Stick"). Sony discontinued PSP in 2014, so cards are legacy stock.
| Capacity | Price Range | Notes |
|---|---|---|
| 1–2 GB | $5–$12 | Bare minimum for a few games/saves |
| 4–8 GB | $12–$25 | Sweet spot for most libraries |
| 16 GB | $25–$45 | Full library + homebrew/ISOs |
| 32 GB (rare) | $50+ | Often relabeled fakes—verify with H2testw |