I'm looking to get a rather unusual SRAM chip (4M x 1 bit, 5V, asynchronous, parallel interface) for a project I'm working on (Yamaha VSS-200). These chips were produced by several companies, but they're all obsolete now and all the stock seems to have been bought by "$250 minimum order, send request for quote" type places. Does anyone know of any possible alternative source for these (I tried all the usual suppliers that I could think of- mouser/digikey/jameco/etc.) or any clever way to trick someone into selling single/small quantities for a reasonable price?