DDR ram(1gb)> more ex, why? because stock is little, demand
is still there for old models. can go up to $100+ for a DDR
ram
DDR2 ram(1gb)> cheap can get from ard $55+ (it show) -$70, $75
(simlim)
self upgrade from simlim.
for acer notebook, dun worry that it will void ur warranty, they
will understand that u upgraded your ram. dun worry even if they
refuse to warrant ur RAM, because ram itself normally comes with
warranty and RAM DONT spoil easily, u can reuse for 10 yrs also no
prob. i jus bought a 1gb ram from simlim ytd @ $75, cause the shop
that sell $70 ran out of stock. my colleague at simlim offer me $65
but he didnt bring, have to wait till today, too troublesome.

hope that this help. 