eBay now has a shopping cart system where you can put multiple items rom multiple vendors and process it for check out. I don't know how eBay handles sales taxes and shipping from multiple vendors but it is a interesting idea.
シェア
SETSUKO 
コーチ探せる 
PSPCF 
佐藤淳一（朝活習慣化キャリアコーチ） 
さわ 
bokushi 
水琴晶子（みことあきこ） 
KUMA 
Pacific Software Publishing, Inc. 
田仲なお美 
Official Bloguru Support