Phew, it's kind of hard to appraise this nowadays since it's SLC, and most consumer SSDs are MLC. Generally it seems SLC drives are twice to three times more expensive than MLC.
I'd compare it to these MLC SSDs:
(similar in terms of read/write speed)
I estimate that your drive is worth around $300? Don't quote me on that though, hopefully someone else here on OCN can help. Consider this post more of a courtesy bump than anything now that I think about it haha