You may buy products from a production's warehouse or sell them in any amount using Production Supply Trader.
Features include the following: * You may buy products straight from a producer in any number; * You can only buy as much as the farm has sufficient finances. Note: Purchasing goods straight from a production is more costly than, say, picking them up from a trade; selling goods in any quantity from a production is possible, but only as much as is available in the production's warehouse may be sold; and traders pay less for goods sold straight from the production.
* * Multiplayer compatibility * Complete compatibility with Production Storage Control (PSC)
* Using XML entries, goods may be banned from purchase or sale based on production.

Thanks to Braeven