Sidekick is under the company of TMobile but it is also available under Danger or Fuse Wireless (both are targeting the deaf audience)
I have my monthly bill for 31.31 (yes, EXACTLY $31.31) from Fuse Wireless for unlimited data plan. If i use the phone, it costs 20 cents per minute *yikes*. I purchased my color Sidekick (not 2... not ready for the change) after the December hysteria in '03 (when they sold it for 75 bucks) settled down and got foot with 140-ish but the total was 160 (INCLUDED rush shipping)... not bad! I didn't use any rebate or discount. People who used discount and whatnot during the hysteria ended up paying $200+ for a COLOR SIDEKICK. Guess you just gotta wait until everything quiets down.
Fuse wireless requires a contract. Usually one-year. Speaking of which, mine will expire soon. Hmm...
I do have positive experience with Fuse Wireless (espcially after Wyndtel) and my sidekick only "broke" once the whole time. And the replacement was a smooth sail.