Hi Lycan .... I don't think an e-storefront exists ... if it's here, I've never been able to find it!! .... I think the e-store thing is designed for you to direct people to your specific offering in your marketing efforts .... Have a Great Day!!
There used to be a CreateSpace store on their website to collectively sell/showcase everyone's work on the site when I started back in December, but it was only for cds/videos and had message 'books coming soon' - then they removed it altogether awhile later. Pity. Would be nice if they put it back and expanded it to include all CreateSpace items. Pretty much the only way anyone is going to find your CreateSpace E-Store is if you tell them about it somehow such as linking to it from your or someone else's website, including it in promotional materials, or something to that effect.