not to rip on supplementkingdom never tried them b4 but bodybuilding.com is pretty good. They ship the same day and its at your door in two. They have awesome customer service and they as well boast having the lowest price
I did a whois search for Supplementcentral.com from WhoisXY.com and found owner details. It looks good. And i visited the site ScamAdViser.com it showed "High Trust Rating. This site looks safe to use." So, that site is legit. You can use it.