Castco customers can purchase the T-Mobile Dash 3G for $89.99 and not for its full price of $349.99. A Castco coupon runs from 13 July to 2 August during which “new customers can save even more and new customers can get a great deal” writes Matthew Miller of ZDNet.

The Costco coupon means that there is a $210 instant savings for a new 2 year activations or customers with eligible upgrades, bringing the Dash 3G to $139.99. Furthermore there is another $50 mail-in rebate for customers who decide to sign up for a $24.99 per month unlimited data plan. In consequence customers can get the T-Mobile Dash 3G for $89.99 from Costco, compared to $169.99 from T-Mobile.

The Dash 3G comes with a 2.4 inh 320 x 240 pixels non-touchscreen display and a 2 megapixel camera. It has integrated GPS receiver and Windows Live/Bing Search application. It also sports Bluetooth 2.0 with A2DP stereo support and WiFi.

The handset runs Windows Mobile 6.1 Standard and has quad-band GSM and dual-band UMTS support for 3G data. It has a 528 MHz processor and measues 4.6 x 2.4 x 0.5 inches weighting no more then 4.2 ounces.

The phone is promising and the deal looks to be great. It’s something to be able to buy this handset for $89.99 instead of $169.99.