Log Jam Furniture, LLC is preparing a bid for a special order of custom furniture that would require $30$ gallons of walnut stain. The company regularly replenishes walnut stain inventory on an ongoing basis because it is used to manufacture many products. The company already has $20$ gallons of walnut stain in stock; this existing inventory was purchased at a cost of $$50\mathrm{.}00$ per gallon. The resale value of the existing stain is $$40\mathrm{.}00$ per gallon. New quantities of walnut stain can currently be purchased for $$60\mathrm{.}00$ per gallon. What is the relevant cost of $30$ gallons of walnut stain when determining pricing for the special order?