Cheaply done and Spur-of-the-moment

Spur-of-the-moment and cheaply done are semantically related. In some cases you can replace phrase "Spur-of-the-moment" with "Cheaply done", this phrases are similar.

Spur-of-the-moment adjective - Made or done without previous thought or preparation.

Cheaply done and spur-of-the-moment are semantically related. You can use "Cheaply done" instead an adjective phrase "Spur-of-the-moment".