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Window and wall units are pretty much the same as far as parts and components. All sealed systems, so other then keeping them clean there is not much to worry about on where to buy it.
Just be sure you keep the filter clean and purchase one that is easy to do. Several units require you to remove the entire front of the unit to access the filter, while others simply have a little door that you open and pull the filter out.
Picture this.... you buy a piece of garbage online that is an off-brand and is known in the
Aside from that, the existing unit you have may be undersized and unless you know how to size the unit to the square footage of your house, you may purchase something too small or too big. You really need a pro to offer you the right solution for your situation so that you can get maximum comfort and efficiency out of your investment.
And adding even to that, you can buy the "Cadillac" of the heating and cooling industry and it may have every bell and whistle known to man on it but, if your ductwork is inadequate, undersized, improperly sealed, or not enough returns you are throwing all of the equiptment's efficiency away.
This is only my opinion though!