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Same here. The last times I tried to get a Pi — three times in three years — the ones I wanted were completely sold out and waiting to restock.
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Where are you based? I just bought 25 from CPC without any issues. Delivered in two days. They aren't as cheap as they used to be, but I understand the reasons why, given how expensive RAM is. Yes, the zero is trickier, but the 2W is in stock on PiHut at the moment.
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Thank you so much for the heads up! They're as 'rare as rocking horse ...' as an old teacher of mine would say. And I've needed one for a project for ages.

Unfortunately thanks to the EU's new tariff regime it would cost over 30eur to ship it here, but luckily I can smuggle one back from my next trip to the UK...

That said for 4 and 5s - I've not had a problem here (Finland) in literally getting them off the shelf of a local retailer (Partco) for the going rate anywhere else.

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It's like they say:

  A bird [redacted] bush.
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It seems very regionally dependent.
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I think battery replacement is only part of the problem, though. Even if you can swap batteries cheaply, you're still dealing with different firmware versions, component revisions
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