U call check 1083, and ask for phone no. of the "leasing department" for each shopping mall.
Then talk to them to ask for the detail info.
But, as far as I know, the exhibition space in citysuper/log-on/jusco/wingon are very expensive. they charge 600-1200 per day +10-15 % commission from your sale revenue.
So, my advice is, don't try these places, unless U are very very very sure that, your product is good enough to make a lot of money per month..
If u are not sure, it might be better to look for shops with short term rental contracts. (eg: 1-3 month)