Some of those pads aren't so expensive nowadays - the apparent glitch with the 1976 TSR ones; actually sold to the public, not only for internal use; reduced the "valuation" of those to a fraction of what it used to be, and the market followed - but individual sheets are perhaps surprisingly uncommon.
Whether that's because people have held on to or, perhaps, trashed over time, their own characters rather than selling them along with the rule books, etc., isn't clear IMO.
In that context, the (unofficial) American Wargamer character sheets of the same period appear surprisingly frequently relative to the "official" products.
All prints of the official 1976/7 GW sheets are rare, too; whether individually, for the first two prints, or in pad form. Still not fully listed/depicted here...

02c, anyhow.
(There should be part pads of the 1978 GWs here, at least, if I eventually dig myself out from underneath things :/).

faro wrote in Individual Character Sheets, '75-'78:<appends, in passing, fwiw>

For-what-its-worth is putting it lightly - I had no idea these existed.

faro wrote in Individual Character Sheets, '75-'78: but individual sheets are perhaps surprisingly uncommon.
Whether that's because people have held on to or, perhaps, trashed over time, their own characters rather than selling them along with the rule books, etc., isn't clear IMO.

Which is a pity. I like to find old filled-out character sheets, notes in the margins of books, & homebrew material.