I can't recommend any that are on the market since I did not like any of the ones I saw in the stores (photographic and arts suppliers) in terms of cost, color accuracy, sturdiness and finish and decided to build one myself.

Its fairly easy to build one. I built mine as a light table with wheels and it is 2 feet wide by 4 feet in length. It uses 2 Phillips 5000K "Natural Color" tubes with a CRI of 92. What really matters is the Color Rendering Index, which is on a scale of 0-100, with 100 being the most accurate, full spectrum light.
The top of the light table has a 1/4 inch milk white acrylic sheet (supplier: wholesale supplier for store front signboard companies) on top of a 1/4 inch glass sheet (supplier: replacement glass shop).
One thing to remember is that the tubes should be around 18 inches (or more) from the glass surface so that the light is evenly diffused. Thats where the 1/4 inch thickness of the acrylic sheet also comes in. If I were to make it scratch resistant, I would sandwich the acrylic between the 1/4 inch glass and another 1/8 inch glass sheet.

The total cost including wood, paint, tubes($6.5x2), glass ($50), acrylic ($26), nails and screws was around $110.

Setting all humility aside ;-), I believe, the results are much superior to what I have seen elsewhere.