The nice thing about raised beds is that you don't have to make them all at once. If the cost or even the size of the project is overwhelming you, try just making 1 or 2 beds this year and a couple more next year.

I started with 2 2x4 beds, then added a 10x10, then this past year we took out the 2x4s and added another 10x10. This enviroment is way to hard on wood (2x4 beds), so we got recycled bricks and made the 10x10 raised beds.