The Walmart stores in the northeast of the US stopped carrying Surges about a year ago. I remember they were selling them for $50. It's my personal opinion that the Surge is too large for the average multi-tool carrier and as such there isn't a wide market for it, so your retail chains may be less willing to carry it. I doubt that it would be discontinued though as it is a well engineered tool and definitely has a faithful market for it
Wal-Mart isn't a good indicator...we still have Cores in most of our local ones, and they've never, ever been on sale. I watch