Here are some links for purchasing your Jiu-Jitsu needs. You may also purchase gear off Amazon from these same brands.
Gameness.com
Kingz | The Official Online Store For Jiu Jitsu Gis and BJJ Gear
www.elitesports.com
sanabulsports.com
us.tatamifightwear.com
hyperfly.com
Apparel Links
T-shirts and sweaters