The smallest rack generally have 3 tubs, use two for you snakes and the third one for storage or an additional snake
You can find those racks on http://cserpents.com/C_Serpents_Hot_...K_SYSTEMS.html, http://www.reptilebasics.com/for-larger-snakes, http://www.apcages.com/
I would recommend C-Serpents, great quality, come with tubs, fast turn around and great customer service.