Your link doesn't work but I assume it is the following:
Link to M4ProductsI just purchased two very similar ones on eBay for less than $5. Each one consists of 48 5630 LEDs, the same as the ones from M4Products. The ones I bought have no regulation so they must be used on 12 volt and are polarity sensitive. Also there is no aluminum backing. The M4Products ones are regulated and work for a wide range of voltages and are not polarity sensitive.
Here's a link to the one I purchased:
eBay LED panelI have no track record yet for these but I have several smaller ones that I purchased on eBay a few years ago and they have worked great.
