Update Table Error!!

Code Snippetupdate dbo.tbl_prod_price
set dbo.tbl_prod_price.product_price = (SELECT ((dbo.tbl_product.product_price) + ((dbo.tbl_product.product_price)*.39)) FROM dbo.tbl_product
where dbo.tbl_product.product_id = dbo.tbl_prod_price.product_id and dbo.tbl_product.product_price is not null)
Where dbo.tbl_product.product_id in (select distinct dbo.tbl_prod_price.product_id from
dbo.tbl_prod_price)







This query is giving me following error:
The column prefix 'dbo.tbl_product' does not match with a table name or alias name used in the query.


Can anybody tell me where I am wrong???Please help.
Thanks,