There are several places where you can buy Battle Spirit products, most are were currently disowned due to the discontinuation of Bandai America. I will be providing you the links as follows:
Amazon (United States)- A variety of BS products.
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Battle+Spirits+&x=0&y=0#/ref=sr_pg_1?rh=i%3Aaps%2Ck%3ABattle+Spirits&keywords=Battle+Spirits&ie=UTF8&qid=1327602522
Battle Spirits PlayMat (America)
http://www.ebay.co.uk/itm/BATTLE-SPIRITS-PLAYMAT-/300512224990?pt=LH_DefaultDomain_0&hash=item45f7eca6de
Battle Spirits Other Products (Ebay) - There are many products from around the world. Link: http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=Battle+spirits&_sacat=See-All-Categories
Amazon (United States)- A variety of BS products.
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Battle+Spirits+&x=0&y=0#/ref=sr_pg_1?rh=i%3Aaps%2Ck%3ABattle+Spirits&keywords=Battle+Spirits&ie=UTF8&qid=1327602522
Battle Spirits PlayMat (America)
http://www.ebay.co.uk/itm/BATTLE-SPIRITS-PLAYMAT-/300512224990?pt=LH_DefaultDomain_0&hash=item45f7eca6de
Battle Spirits Other Products (Ebay) - There are many products from around the world. Link: http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=Battle+spirits&_sacat=See-All-Categories
