Been waiting a year now for a decent sale on a memory card, but that's yet to happen. Have they EVER gone on a decent sale? Not about to throw out like $30 to double my space, or $70 for a 32.. that's just crazy.
best thing to do is look for store deals where you can get this/that much off after spending this/that much money. you can then use it to buy items you want lower priced. i did that with the DS4 and got it for $35.