This is the tried and true.
The one I pictured, I got at ACE. We have a Lowe's but they don't stock it. Neither does our W-Mart.
I think I've found out why it's so rare - Elmer's apparently doesn't make it any more. It's not shown anywhere here:
https://elmers.com/search-results/Products/wood filler
Nor is it anywhere in their MSDS listing:
Wood Filler & Other Repair:
Carpenter's® Color Change Wood Filler Dries Natural - 4oz
Carpenter's® Color Change Wood Filler Dries Natural - 8oz
Carpenter's® Color Change Wood Filler Dries White - 16oz
Carpenter's® Color Change Wood Filler Dries White - 4oz
Carpenter's® Color Change Wood Filler Dries White - 8oz
Carpenter's® Interior Wood Filler 1 pint
Carpenter's® Interior Wood Filler Golden Oak -3.25oz
Carpenter's® Interior Wood Filler half pint
Carpenter's® Interior Wood Filler Mahogany - 3.25oz
Carpenter's® Interior Wood Filler Natural -3.25oz
Carpenter's® Interior Wood Filler- Quart
Carpenter's® Interior Wood Filler quarter pint
Carpenter's® Interior Wood Filler Red Oak -3.25oz
Carpenter's® Interior Wood Filler Walnut - 3.25oz
Carpenter's® Interior Wood Filler White - 3.25oz
Carpenter's® Stainable Interior-Exterior Wood Filler 16 FL OZ
Carpenter's® Stainable Interior-Exterior Wood Filler 32 FL OZ
Carpenter's® Stainable Interior-Exterior Wood Filler 4 FL OZ
Carpenter's® Stainable Interior-Exterior Wood Filler 8 FL OZ
Carpenter's® Stainable Wood Filler -3.25oz
Interior-Exterior Wood Filler Max - Stainable - 32oz
Interior-Exterior Wood Filler Max - Stainable - Pint
Interior-Exterior Wood Filler Max - Stainable Golden Oak - 6oz
Interior-Exterior Wood Filler Max: Stainable - 6oz
Interior-Exterior Wood Filler Max: Stainable Cherry - 6oz
Interior-Exterior Wood Filler Max: Stainable Natural - 6oz
Interior-Exterior Wood Filler Max: Stainable Walnut - 6oz
Interior-Exterior Wood Filler Max: Stainable White - 6oz
ProBond® Concrete Bonder Quart Bottle
ProBond® Interior-Exterior Cherry Wood Filler - 3.25oz
ProBond® Interior-Exterior Golden Oak Wood Filler - 3.25oz
ProBond® Interior-Exterior Natural Wood Filler - 3.25oz
ProBond® Interior-Exterior Stainable Wood Filler - 3.25oz
ProBond® Interior-Exterior Stainable Wood Filler - Half Pint
ProBond® Interior-Exterior Stainable Wood Filler - Pint
ProBond® Interior-Exterior Walnut Wood Filler - 3.25oz
ProBond® Interior-Exterior White Wood Filler - 3.25oz
ProBond® Interior-Exterior Wood Filler: Red Oak - 3.25oz
ProBond® Interior-Exterior Wood Filler: Stainable Cherry 6oz
ProBond® Interior-Exterior Wood Filler: Stainable Ebony 6oz
ProBond® Interior-Exterior Wood Filler: Stainable Golden Oak 6oz
ProBond® Interior-Exterior Wood Filler: Stainable Natural 6oz
ProBond® Interior-Exterior Wood Filler: Stainable Walnut - 6 oz
ProBond® Interior-Exterior Wood Filler: Stainable White 6oz
Note that all of the interior/exterior varieties are now listed as stainable or are already some wood color. That fact is prominently shown on their now-different packaging.
Here's the MSDS for the good old stuff we've or, at least, I've been using from some years-old tubes of it:
https://elmers.com/docs/default-source/msds-sheets/me842-htm
Note that it's a clay mix and has three ingredients listed as hazardous - limestone, calcite, and quartz (dusts). Odor is described as mild. To my nose, it would be described as "none" or "wet clay."
ALL of the MSDS PDFs I've checked in the above modern list of Elmer's fillers had "100% nonhazardous substance" in their "composition/information on ingredients" section and all had their odor listed as "mild acrylic odor" which, from smelling the 8oz Elmer's Color Change Interior and 16oz of White Interior filler I now have to try, I would definitely agree with. They smell like latex paint.
EDIT: actually, the color change type has a strange odor, like rubber.
So, the reason that the clay filler type we've used in the past is so hard to find and may disappear is because Elmer's has switched from a clay with hazardous dusts within it to 100% non-hazardous acrylic mixtures across its entire line.