Electrical wall plates can be purchased online at a variety of
sites such as eBay, Amazon, Lowe's, Home Depot, Yahoo Shopping and
Wall Plate Warehouse. You could also check out local electrical
stores as they are likely to have wall plates as well.
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VGA wall plates can be purchased from a manufacturer or
otherwise they can be purchased online from resellers such as those
which can be found on eBay.
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HDMI wall plates can be found at many retailers online. Best
Buy, Future Shop, and Visions Electronics all sell HDMI wall plates
from their websites.