There's no need to spend hundreds of dollars on a sunrise alarm clock. Just buy some super-bright, flat white bulbs[1] and a timer[2]. (And a lamp if you need one, of course.) Sure, it doesn't get gradually light, but the main thing is that it's very bright when you get out of bed, which is really pleasant!
[0] http://www.amazon.com/gp/product/B00198U6U6
[1] http://www.amazon.com/gp/product/B0040718V4