I thought the same as you but the word is 'minimal'. It works just as well. 'Warehousing costs will be minimal as there will be little or no stock that is needed to be stored.
Minimalize is, I presume, an Americanism, as it is listed by neither The Oxford English Dictionary nor Chambers Dictionary, the leading British dictionaries.
Accordingly - if you're American - use it...otherwise don't. Having said that, I know that minimize with no central al is perfectly acceptable, even in America.