EF-S 18-135 STM: Is there more than one?

Guys, need your help.

I saw an add from a store (link here) in Sydney for this lens at $449. Every other shop has it for $699. A few other shops that I spoke to said that there is an older version of this lens (but I can't see a previous "STM" version). I've sent an email to this shop but haven't heard back.

Is there indeed 2 versions? Is the price too good to be true?

Many thanks.