I bought a cheap (price, not quality) LCD camera-top monitor recently. Shown here at a rally with President Obama.
The standard definition monitor is perfect for my Canon GL-2, and the "Buy-it-now" price on eBay was $139 (shipping included!)
Here's the link on where you can get this useful item.
And they also have an HD version, but that's a lot pricier. Better if you can output SD from your HD camera and use the cheaper monitor.