Hi chickadee,
There isn’t a specific forum list for the Walpole area but the closest options or possibilities I’m aware of (subject to making sure that any mattress you are considering meets your specific criteria and the quality/value guidelines here) would be in the list for the area in and around Topsham, VT in post #4 here or the or the list for the area in and around Merrimack, NH in post #4 here.
I also took a quick look in the area in and around Walpole to see if there were any options that may be worth considering that were closer to Walpole, NH (latex or otherwise) and the better options or possibilities I could see include …
aumandsfurniture.com/ Walpole, NH. They carry Gold Bond mattresses but when I called to ask them they didn’t carry any latex mattresses.
plotkinfurniture.com/default.asp Keene, NH. They also carry Gold Bond mattresses including an all latex mattress and a latex/innerspring hybrid.
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https://www.lovesbeddingandfurniture.com/index.html Claremont, NH. They carry Pure Talalay Bliss Talalay latex mattresses.
Phoenix