"purchase price" and "sale price" are defined in clause (d), (ee) and (h) of section 2 as follows: " (d) 'Goods ' means all kinds of movable property other than actionable claims, stocks, shares or securities and includes all growing crops, grass and things attached to or forming part of the land which are agreed before sale or under the contract of sale to be severed, " (ee) 'Purchase Price ' means the amount payable by a person as valuable consideration for the purchase or supply of any goods less any sum allowed by the seller as cash discount according to ordinary trade practice, but it shall include any sum charged towards anything done by the seller in respect of the goods at the time of or before deli very of such goods other than the cost of freight or delivery or the cost of installation when such cost is separately charged; "(h) 'Sale Price ' means the amount payable to a dealer as consideration for the sale or supply of any goods, less any sum allowed as cash discount according to ordinary trade practice, but including any sum charged for anything done by the dealer in respect of the goods at the time of, or before delivery thereof".