I've been thinking of doing the same and snatch the chips from an early Pentium mobo which sometimes had this type of chips...so maybe you should keep a lookout for an old board that will cost peanuts?

I just keep buying old motherboards, when I see cache chips on the photo 😀. Of course sometimes you end up with a bunch of 128 kb 25 ns chips, so you need also some luck (unless the photos of the sold mobo are high-quality so you can see what chips are used).

Buying up old motherboards is not the solution, unless you are someone like Amigaz and are doing it anyway.

The expenses will be terrible and the returns will be almost nothing.

Maybe that would work with chips from an early Pentium board, but it would be difficult to say those are internally the same. There are a lot of variations out there as any quick look at the datasheets will show.

It is worth a try being fully informed there is a set of 1mb on the board.

Well, I don't buy every motherboard, but if I see 10 motherboards: some with cache, some with RAM, some with CPUs, then spending 15-20 Euro including shipping is not a problem, since after removing all parts I need I can sell them for a similar price.

When you do that the amount of time you spent looking up prices for the things you want to sell, talking with potential buyers, shipping packages, &c. will be very costly.

In essence you will be losing money.

If you have a 1mb set you wish to sell I'll buy from you at market value.