Another option is the Travelcade Gel seat from Dual Star. Although I've never had any issues with Dual Star, some here are having some bad customer service issues with them, similar to the terrible customer service I've received from Corbin..
I will never, ever again use a Corbin product..
There's also cheap ways (ATV seat cover sold at Walmart, if you can find them) and also you can alway go the less cheap route and have Russell or some of the other aftermarket seat manufactures make you a custom seat. You'll only regret the amount you spend on a custom seat until the first time you sit on it.. Then you'll just smile and be glad you did it.. (Corbin is NOT a custom seat manufacturer)
I'm sure there'll be other suggestions. If you want to go the really cheap route, I have a few spare ATV seat covers from Walmart and can get you one to your door for $20. At that, I'm not making a dime on them, either.. I just have 3-4 extras.