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$425
For sale is a lifetime non-subscription 2nd-generation AMB 260x with wall charger and fork mount. It blinks 4 blinks after a charge so the battery is still in great shape.
They are worth their weight in gold now because the new ones require a yearly subscription. Looking around, they are selling used for $600 on ebay.
If you are just getting into racing, you'll be able to sell this when you're done for this same price or likely more. Not to say it's a great investment but it sure beats renting at the track or paying a subscription.