Hello:
I want to build a small B2B ECommerce website,could you please recommend me a suitable and cheap package(or hosting service)? (Below $400,$30/month)
Following are the features required:

Built-in Affiliate system and tracking
B2B area with secure "members login"
UPS shipping calculator and tracking
Tax Calculator
Inventory Control system
Product "Search" driven database
Secure shopping cart system - Holds up to 50 products