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!).

December 11th
Advanced export: version 2.0.1, updated section “Setup fields”

December 4th
Phone orders: version 3.2.2, override link “Customer payment page” in order, “role” field for new customer, checkbox “tax exempt”.

November 26th
Dynamic pricing: version 1.5.1, update price when user changes quantity at product page

Free plugins are available in official WordPress repository.