You have two basic choices - either option should work OK for you.
(1) You can find many online sources for 'generic' AC adapters that should work fine. An example: AC Adapter For ACER Aspire One 532h $11.56 (always check shipping charges too)
You should be able to tell this isn't an actual ACER Aspire One 532h adapter. Hint: Brand New Replacement Product, works as genuine parts, 100% OEM Compatible!!
What's most important are the electrical specs: Output: DC19V 1.58A and Power: 30W Max. This should be an exact match to what's on the Acer part you [strike]have[/strike] had.