Expect to pay between $500 and $2,000+ depending on condition and rarity. M1 units are often the most affordable ($500–$800).
Available in White, Black, and a rare Champagne Brown (Honey). The M3 is the most sought-after by collectors. ERS-7 Aibo Overview | Learn About Aibo | Virtual Paws Virtual Paws Sony AIBO ERS-7M2 - Review 2005 - PCMag UK ERS-7 Aibo Overview | Learn About Aibo | Virtual Paws Virtual Paws ERS-7M3 Product sheet 3 Sony Aibo ERS-7 Champagne | #1846491611 WorthPoint Sony AIBO ERS-7M3 (Pearl White) : Amazon.ca: Toys & Games 2. Market Pricing and Availability
Original batteries are likely dead or have a 20-minute lifespan. You will likely need to find a specialist to "repack" the battery with new cells.