How much does this cost to the nearest dollar?

NC Low Temperature Stirling Engine Model Toy DIY Mini Stirling Engine Generator Model Toy
How the engine works? This type of engine works in theory of thermal energy convert into mechanical energy, It take a temperature difference between the top and bottom plate and turn it into rotational energy, rotating the flywheel. simply placing a cup of warm coffee/tea underneath is enough for it to workGeneral DescriptionExquisite workmanship, good for personal collection and or gift presentation for home aluminium alloy base plate, super thickness base plate, yes, a cup of hot water will easy run this engine If necessary to lubricate the crankshaft and connection bar, it was ONLY USE LUBRICATION POWDER to do so, NEVER use oil to do so because the oil may occur stains that will degrade the flywheel running

Price is $46.00
Price: $45.99