If you're looking for an S.O.T. (sit on top) design try this. Lots of good general kayaking info too.

If you want durable and under 1K you're probably looking at a polyethylene boat.

REI has a good selection and if you can pick up your boat at one of their stores shipping is free. Kayaks are big bulky items and shipping alone can add 10% or more to the cost.
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If you only travel on sunny days you will never reach your destination.*

* May not apply at certain latitudes in Canada and elsewhere.