it's the mythology that goes with them, they are only $.50 each from digikey, they aren't obsolete - it's just people trying to rip off guitar people because guitar people can be quite gullible.
I bought loads of them ages ago just because they were dirt cheap cause they are such poor op-amps and I thought it would be good to just have burn-out ICs, mine are harsh environment ones too (they are in a metal can and can go to space)
www.paulinthelab.com - Stripboard Layouts