While the HTC Pure from AT&T hasn't been as successful as planned, it's still a very good Windows Phone. And lately, it looks like you can pick one up for a steal of a price.
AT&T is offering refurbished Pure's for free (with the obligatory two-year contract) on their main website. It's an AT&T web-exclusive and not available through retail stores.
For the AT&T Premiere Customers (available through many employers) you can pick one up for $39.99. You'll need to hurry on this one because the sale ends tonight at midnight (PDT). Oh...and the same sale has the Tilt2 going for $74.99.
While the new Windows Phone 7 is due out in a few months, these price cuts should help if you're looking for an inexpensive way to get into a Windows Mobile Phone.