There was a thread here on edible portion/weight for bone marrow. Your $6/lb is really entering
filet mignon prices for animal food when realizing how little of that weight is edible. If you have a 'budget' of any kind...I wouldn't really buy it unless fat is just a small amount of your intake. On a fat based diet, maybe if you are eating an already fatty steak that is fresh, buy some fresh marrow - type of thing.
Scott Wheeler (Who is one of the main AV acolytes these days. Dude really knows his stuff) seems to part somewhat with AV on freezing..in terms of how damaging it is anyway [search his site for: "bone marrow"]
"Eating frozen bone marrow is not harmful but most of the nutritional benefits will be compromised. The same is true for meat, although muscle meat is less likely to contain stored toxins so conventionally raised is acceptable occasionally."
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IMO, sources of collagen, fat, and fatty organs (which likely freeze
well) or otherwise (liver,glands etc..)... that have been frozen being deemed as "not harmful but lacking x benefits" by basically extremists, translates to me in non-primal-speak as "we don't know how much benefits are lost (or increased) with freezing". Odds are, any variety achieved through these foods (even frozen) is better than 'supplementing' your diet with only seafood, eggs, fruits/veggies, or even wild muscle meats IMO...as these nutrients are NOT the same.
- Probably not a good idea to eat ANY kind of grainfed fats/organs etc...of course.
That said there can even be arguments that freezing maintains nutrients. Largely the issue for most folks is the"problematic bacterias", but here you have Wheeler at least saying that really isn't much of an issue. If one doesn't find themselves totally sensitive to frozen foods, probably ok to keep them in regularly.
...Years later if one is still on the diet one can stress more over such things and compare/contrast.
Just my take.