I know it's not a super saving but I would be surprised to see it get any cheaper!
They often go between 65-75 used on ebay so can't be bad!
Cheapest I can find it for!
Please note that this is from an amazon seller called swan dice, they have 95% positive feedback from 4.473 ratings.
I would personally buy it from amazon for £86.47 for piece of mind with returns and such.
Great little lens which is shown by the 5 star rating on amazon from 353 reviews.