Groupon offers the Ion iPics 2 Go Photo Scanner for iPhone 4 / 4S, model no. ISC31, for $16.99 with free shipping. That's tied with our mention from last week and the lowest total price we could find by $3. It scans 35mm negatives, slides, and both 3x5" and 4x6" pictures to your iPhone. Deal ends October 25 at 12:59 am ET.