ram expansion:

commodore a2058
	machine:	a1500/2000
	price:		£746.35 (1991)
	comments:	price includes 2mb; extra is £299 per 2mb(1991) - upto 8mb.
	
commodore a501
	machine:	a500
	price:		£119.00 (1989)
	comment:	internal 512k ram plus clock.