When Stone Retrieval Unit enters the battlefield, create a tapped Powerstone token. (It's an artifact with “{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.)
Automatons could be rebuilt. Powerstones could not.
Near Mint - $0.25
Lightly Played - $0.24
Moderately Played - $0.20
Heavily Played - $0.15
Damaged - $0.13
Near Mint Non-English - $0.25
Lightly Played Non-English - $0.24
Moderately Played Non-English - $0.20
Heavily Played Non-English - $0.15
Damaged Non-English - $0.13
Foil Prices
Near Mint Foil - $0.25
Lightly Played Foil - $0.24
Moderately Played Foil - $0.20
Heavily Played Foil - $0.15
Damaged Foil - $0.13
Near Mint Foil Non-English - $0.25
Lightly Played Foil Non-English - $0.24
Moderately Played Foil Non-English - $0.20
Heavily Played Foil Non-English - $0.15
Damaged Foil Non-English - $0.13