We parked above Wilko last year. It was fairly cheap but it turned out that it wasn't the cheapest though and was a bit of a walk away from the hotel.
I have a vague recollection that I found a Blackpool council website with car park details on - will have a hunt for it when I have a minute.
Remember that street parking around the Winter Gardens is (well, was) free on a Sunday though so worth moving your car out of any car park for the last day.
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