Yes, I found all sorts of variations when I was looking at battery prices. At the time I bought the Bosch S4 for the Focus, they were on offer at Eurocar Parts for around £40, so I ordered one on-line and collected next day from the store - about 300yds away from our house. A few days later, the price had gone up to around £52.
A week or so later, looking at batteries for the Astra, the (bigger) S4, appropriate to the Astra, was about £60 at Eurocar Parts on-line, but a few quid cheaper if you purchased via their e-bay shop - so I ordered one. According to the rules, you couldn't pick it up from the shop, and it would be a 3-day delivery. Next day I received notification that it was on its way - and it was delivered 31hrs after placing the order.
If you suspect that it's nearing the time to replace the battery, then it might be a good idea to get it as soon as an offer looks reasonable. You can bet your bottom dollar that it the battery fails suddenly, it will be top price for a replacement from all suppliers and a week's delivery!
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