How much does this cost to the nearest dollar?

Stirling Engine, Single Cylinder Sterling Engine Model Steam Power Physics Science Lab Teaching Tool with Led Light, Gift for Kids Adults Craft Orname
Specification Condition Brand NewItem Type Stirling Engine Material Stainless SteelColor As picture Package List 1 x Stirling Engine with LED Light1 x x Alcohol x Quartz Tube with Iron Wire The product has been assembled and can be used directly. Superior stainless steel structure, rugged and durable to use. An ideal choice as a gift for friends, kids, family and more. Similar to the working principle of internal combustion engines Burning alcohol lamps provide power heating to expand the internal gas, thereby increasing the power of the internal molecular gas to act on the flywheel. With the help of the flywheel, thermal energy will be converted into mechanical work. Through hands-on operation,

Price is $31.00
Price: $30.95