My sweetie gifted me a used Palm Tungsten T (m550) for Christmas. It takes SD(Secure Digital) Cards for additional storage. SD seems to be replacing Compact Flash cards all over the place. I found a Transcend 1GB Secure Digital (SD) Card for $64.81 (including S&H) at NewEgg, & recommended it to a friend. I love NewEgg, and have spent thousands of dollars there - mostly for other people.