The iPod touch is officially dead, but which iPod models are obsolete?

Obsolete Apple products are devices that haven't been sold for seven years.
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iPod - Wikipedia

In Memory of the iPod: The Most Underappreciated Apple Device - Paste Magazine

Identify your iPod model - Apple Support

iPods are selling for THOUSANDS on as Apple announces it's discontinuing them after 20 years

Current iPod Touch Now 1,000 Days Old With No Sign of New Model : r/apple

Keep or Sell Your Old iPod? Apple iPod depreciation data revealed

Identify your iPod model - Apple Support

Used iPods Likely Not Worth Keeping as Collectors' Items Despite Uptick in Value After Discontinuation, Data Shows - MacRumors

Restored iPod models are selling out at retailers after only a year of being discontinued