For a limited time Handspring is offering the Treo 180 series integrated PDA phone for only $99.99 after a $150 mail-in rebate. You do have to sign up for at least a one year plan with T-Mobile to get the deal.
This offer is only valid through the Handspring site while supplies last.
When Handspring first brought out the Treo 180 I was a pretty big fan (once it was running). Check out the review. I also have to give Handspring credit for the GPRS upgrade and the various software upgrades that make the Treo line the best integrated device out there.