Ram Chips Specification.
2101 NMOS RAM used on Game pcbs by all manufacturers not just Atari Price £1.25 each plus P&P to any U.K. address.
2114 1kx4 SRAM used on Game pcbs by all manufacturers not just Atari Price £1.00 each plus P&P to any U.K. address.
2125 (9125) 2125 (9125) Ram used on Game pcbs by all manufacturers not just Atari Price £1.25 each plus P&P to any U.K. address.
27LS00 256 x 1 bit BiPolar RAM for use in high speed buffer memories Price £2.00 each plus P&P to any U.K. address.
4116 4116 Ram used on Williams games like Defender etc Price £1.00 each plus P&P to any U.K. address.
4164 4164 Ram can be used with small mod on Williams games like Defender etc Price £1.00 each plus P&P to any U.K. address.
5101 Cmos Cmos Ram used on Williams games for battery back up memory Price £4.00 each plus P&P to any U.K. address.
6116 (Wide Body) 2K x 8 Ram used on quite a few Atari Vector game pcb's Price £4.00 each plus P&P to any U.K. address.
6116 (Slimline)  
7489 7489 Ram found on Atari Tempest pcb's Price £1.00 each plus P&P to any U.K. address.
9016  

Other IC's Specification.
NE555 Highly stable monolithic timer, used on Game pcbs and HV pcbs Price 25p each plus P&P to any U.K. address.
NE556 Two timers in one package, used on Game pcb's amongst others Price 70p each plus P&P to any U.K. address.
NE566 (LM566) Function Generator used on Asteroids pcb's for sounds. Very hard to source Price £10.00 which includes P&P to any U.K. address.