Analogue-sequencer

I'm just about to build my P3, pcb's arrived today :-) 
I have all of the parts except for the 62256 SRAM chip, Farnell and 
Maplin are out of stock, ESR just seem to have the narrow (0.3") 
28pin dip version rather than the required 0.6" 28pin DIP item.

Anyone have any ideas on where I could get one, or anyone have a 
spare one they'd like to sell me?

Cheers,
Allan