Toyota executives expressed reservations at the Frankfurt Auto Show about the current costs of electrically-assisted cars, but buyers who want an affordable and environmentally friendly vehicle could take a look at less expensive used Toyota Priuses in New Jersey.

The company has been testing new lithium-ion batteries that have reportedly shown promise as replacements for the costly nickel metal hydride batteries currently used in Prius production, but it may be another decade before new models become cost effective for mass market consumption, reports CNET Tech News.

Electric vehicles of today are less costly than in 1990s, but if you compare them with the other vehicles out there they are still too expensive,” Takeshi Uchiyamada, Toyota executive vice president, told the news provider. “Unless there is a very big breakthrough in battery costs I don’t think electric vehicles can take a large market share.”

Thanks to the depreciation common to pre-owned vehicles, however a used Toyota Prius in New Jersey may offer increased fuel economy at a price that may be attractive to more buyers.