Your can find a very good and affordable retreat at
www.dhamma.org

Here is a snip from the home page.

The technique of Vipassana Meditation is taught at ten-day residential courses during which participants learn the basics of the method, and practice sufficiently to experience its beneficial results.
There are no charges for the courses – not even to cover the cost of food and accommodation. All expenses are met by donations from people who, having completed a course and experienced the benefits of Vipassana, wish to give others the opportunity to also benefit.

I have been on 4 of these retreats and can highly recomment them.