That's the trouble with low volume parts. Much as I hate to say it, try the fb groups, they're a nightmare to figure out/ find stuff (for me anyway, lol) but you do get a high volume of people posting on there and a lot of exposure, so even if you post a wanted ad there you're likely to get others posting links to ones they know of for sale.
They're like buses, as soon as you find one and buy it, 93 others will come up and be 1/4 the price......always the way!