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My guess from a buyer's point of view which assumes it's from factory loads once fired, not corroded and not damaged in any way, and is based on remaining case life -
Depending on the brand, assume new 338 WM brass is $X a piece. Assume no more than Y reloads per case before it gets tossed and it's been loaded and fired once already.
depends if you bump the shoulder back or not as well- if it's something like a bar where the shoulder gets bumped back every time no more than 3-4- no bump ,maybe 1 or 2 more - this is assuming full strength loads with 250- 275/300s slugs- where the 338 was meant to be
A quick survey of pricing for new brass for comparison: Hornady - $90.99 per 50; Nosler - $134.99 per 50 (Cabela's - backorder-able). Might be cheaper to acquire brass by purchasing factory loads.