I have bought two kayaks from Capacity Sport a plastic Penguin and a Mirage Fiberglass.

They shared there excellent knowledge of the right equipment to meet my needs.
It would be wise to purchase a life jacket for safety!

They have a huge show room with a wide range of kayaks to suit the river and also on the bay and in the ocean.

Approximate cost: $1500 cheaper for a basic sit on top kayak