Groupon offers the 3M Streaming DLP Projector Powered by Roku, model no. SPR1000, for $169.99 with free shipping. That's the lowest total price we could find by $39, although we saw it for $20 less a month ago. This projector streams media directly from Amazon Instant Video, Netflix, Hulu Plus, and more via a Roku Streaming Stick. It features up to a 120" wide picture, 60 lumens, and up to 2.5 hours of battery life. Deal ends December 24 at 1 am ET.