We coded and support following plugins for Woocommerce:
Advanced Order Export, Phone Orders, Advanced Dynamic Pricing
The resources for export plugin: code samples , codes for some plugins or FAQ
You can submit ticket to Support (not 24×7, but free users are welcomed too).
Please, mention plugin name in ticket.
Recent changes in Pro versions (Pro version already includes all changes made in free version!).
Advanced export: version 2.0.1, updated section “Setup fields”
Phone orders: version 3.2.2, override link “Customer payment page” in order, “role” field for new customer, checkbox “tax exempt”.
Dynamic pricing: version 1.5.1, update price when user changes quantity at product page
Free plugins are available in official WordPress repository.