Wordpress MU plugin for users to swap items for credits

What I need or require: To find a wordpress MU developer to build the backend programming so that users can post their unwanted items for store credits which they can use to get other posted items on the wordpress MU + buddypress site. Basic Overall Functionality 1) Allow users to add their unwanted items for credits to the site by providing product pics, description, price and other detailed info in the front end (hope developer can either build from scratch or customize Marketpress WPMU dev plugin to do this) 2) Allow users to checkout items using store credits (it'll be best if the cubepoints plugin is used since another component of the site will allow users to post sharings and obtain store credits) 3) Limit quantity of each item to 1 only where the item will be automatically moved into pending/history (meaning not available for others to swap) after checkout. 4) in terms of shipping, user will need to arrange pick-up of the item on their own or they can choose to use the site's courier where they pay cash upon delivery. Once the item has been delivered, the receiving user must update the status that they've received the item and give a rating to the owner. 5) Allow user to purchase store credits through bank transfers if they don't have enough store credits (users will have a form to post a pic of their bank slip) 6) English / Chinese bilingual (hope to use qtranslate plugin or other plugins for users to translate the content) 7) A coupon code will be assigned to each registered user where they can share with friends. Each friend can use the coupon code once during their first order and everytime a friend uses, a certain # of store credit will be rewarded back to the user who shared the code What I already have versus what the contractor will deliver: This is a brand new site but all front-end designs (logos, pics) and the sharing component of the site is currently under construction For those who're interested, please provide portfolio link, a quotation and estimated time of delivery. Thanks, Carol