WireFly now has the HTC Arrive, the first Windows Phone 7 smartphone for Sprint.  The regular WireFly price is $49.99 with a two-year contract, but with coupon code ARRIVE0331 you can get an additional $25 off for a total cost of $24.99.

Coupon code valid only on new Sprint accounts.   Ends March 31st.

Amazon also has the HTC Arrive for $49.  The Sprint direct-price is $199 with a two-year service agreement.