After T-Mobile announcing an April 20 availability for both the LG Optimus 2X carrier variant called T-Mobile G2x and the Sidekick 4g, follow-up to the successful Sidekick, Wirefly has both devices on pre-order and makes the deal sweet by adding in a discount.

While the T-Mobile G2x will officially go for $199.99 after a $50 mail-in rebate and the Sidekick 4G for $99, Wirefly is offering the G2x at $149.99 and the Sidekick 4G for $79.99, both with a new T-Mobile account. Those are sweet prices and the date to circle in your calendar is April 20.

The G2x sports a 4-inch WVGA screen, Tegra 2 dual-core 1GHz CPU with 512MB of RAM, eight-megapixel rear-facing camera (capable of shooting 1080p video) and a 1.3MP front-facing camera. The Sidekick 4G packs a 3.5-inch WVGA display, a 1GHz Hummingbird CPU and is powered by Android 2.2. Anyone pre-ordering?