This is Alex Hu with DCSproduction.com, recently we worked with
http://aaatex.com/ of their QuickBooks Cart integrator for
http://www.weneedsigns.com/ case. Client is asking for automatic polling the X-cart orders to QuickBooks Enterprise every X minutes. The client online store is well established. It requires detail sales rates (70 rates in California), discount, coupon, create item, create customer in the fly. The implementation took about 10 days. It won't be easy because every store has its unique idea of doing business. Expense is at $699 (software license & 2 extra hr support) plus our time to support this implementation.