cheap ebay wide angel jelly lens on raspberry pi camera review

i once saw this awesome post that i got so envy have make one with a cheaper alternative. the post author uses kogeto dot as a camera add-on on his raspberry pi that costs too much for me. so… i am looking for a cheaper alternative. it does not have to be the 360 degrees panoramic type, a simpler but can take wide angle is enough.

i ordered several different type on ebay and the first that arrive is this jelly lens:
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