It's/they are called 'MOKA' - there are three shops.
They are essentially a 'nuts, berries, spices, sweets, freshly ground coffee type shop, but certainly two of them also have Asian goods.
In the centre, there are two.
After you go through the old gate (straight down from the cark park/park), a little way down you will see a small bakery on your right. To the right you will see Moka - the larger of the two. Not sure if they really have foreign spices as long time since been there.
If you go straight down past the bakery, across the crossroad, and the smaller (original) shop is a short way down on LHS.
I am assuming you can still ask to go upstairs - VERY steep and narrow but an Aladdins' cave of foreign spices, etc., once you get to the next level.
The other, which is larger became regarded as 'Head Office' (they used to be most willing to order anything exotic for you) is the other side of Rethymnon. If you know where the old Fire Station used to be, the shop is a little further along on the LHS on a corner. It is a mostly glass store-front and side, and pretty easy to see.
The spices, etc. always used to hidden a bit i.e. on a very tall shelf unit towards back of the shop on LHS facing the side window (which has a full length blind) - bit like going into a kind of corridor.
(p.s. I just found a forum link from 2010 which might be the one you were thinking about ??? viewtopic.php?t=2782