ORIGINAL: Bax
That is an HPI part. We do not service HPI. They set the retail price, which is shown as $47.00 on their website. Here's their web page:
http://www.hpiracing.com/products/en/15466/
Tower gives it a discount similar to the discounts they offer on other parts and accessories.
I would suggest that if Tower (Great Planes, Hobbico, etc.) is going to be in the gas engine business they simply sell the Genuine Walbro carb gasket and rebuild kits under their own name. Prices should then be in line with any other on-line sourch.
For the record, Horizon has the K10-WAT kits as follows:
http://www.horizonhobby.com/Products...ProdID=ZEN2372
These fit most WT series carbs and the prices are not out of line.