(a) Consider combining property into lots when the quantities, value, or nature of the property makes it uneconomical to sell separately.
(b) When lotting is appropriate and economically practical-
(1) Size the lots to encourage bidding by small businesses or individuals;
(2) Lot unused items by make or manufacturer, except when quantities or dollar values are small;
(3) Lot commercially similar items when practicable;
(4) Lot used and unused items separately unless quantities, value, or nature of property makes it uneconomical to sell separately;
(5) Size lots large enough to ensure the selling costs are not disproportionate to the anticipated proceeds.