Is it a town sticker or county sticker that you need ?
While sticker parking is always in forced, The booth is closed after 5. Otherwise for residents it's 20 for the year, 5 for the day, 15 for non residents per day.
If your mom's from selden she might have a permit sticker already which allows free parking.
I usually buy a permit for the whole season for $20. But, if I have to guess it is $15 for a day
I think it depends on time of day and where you park but it is usually 10.
Parking is 10
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