http://www.kitguru.net/components/ssd-drives/anton-shilov/apacer-256gb-ssds-will-cost-less-than-70-in-the-second-half-of-2015/
128GB SSDs will cost approximately $40 in 2H 2015.
I think this is actually likely since right now, you can buy 256GB SSDs for $100 (Crucial MX100 comes to mind) and SSDs are getting cheaper as time goes by. What do you think?