The Charlotte Aeromodelers' field is AMA members only, and club memberships is quite expensive.
North Charlotte's Waymer Aeromodeller Flying Field - AMA only, but it is part of a Mecklenburg County Park that is subsidized by "Park Passes" apparently. Their "Park Pass" is only $30 a year - it is an approved FRIA - but AMA membership for insurance is required.
I fly in the huge Francis Beatty Park in South Charlotte quite often. They have baseball fields and an empty field adjoining that gives lots of room with few trees. It is not a FRIA, but I don't care. MBT trails are nice for quads when they are empty. Park rangers are helpful and accepting of UAS flying.