Personally I do agree with you against RAID0 for SSDs, I am just stating that it might be useful/cheaper.
"Few weeks ago"...
You might as well started of "Once upon a time".
"Few weeks ago" is not the same as "Once upon a time", since in my case, I am implying that it happen often.
The link I posted also shows the minimum prices for each size, which could very likely reach that low again soon, like when there is stock clearance or price war when a new model from a competitor is released.
Minimum prices:
240gb= $73 , .. 2x240gb= $146
480gb= $180
There is few more examples:
Lowest prices for other than the m500:
Samsung 850 pro: $149.99 / $319.99
Samsung 830 (OLD): $154.99 / $439.99