fresh in-the-shell inexpensive chestnuts can be found at Korean supermarkets. I know the one in the Koreatown Galleria (on Western & Olympic) has them right now.
They also have shelled ones in small bags displayed all around a pillar between the frozen dumplings section and the kimchi.
TJs sells them in the shell by the pound (in a plastic container in the unrefrigerated produce section) and shelled and vaccumm sealed in both the refrigerated section (in 6 or 8 ounce packages) for the new packaging or in a red box (also vaccuum sealed) in the nuts section.
I'd call and ask the store though, because the availability depends from week to week, but I see them regularly from november through december at just about any TJs.
HAving fussed with the in-the-shell variety before, I much prefer buying the shelled meats and using those instead.