You can use raw sql to insert the values in the relevant DB table with prices.
Still it is much better if you use another class as this way you will have the hibernate version control and you can freely use all the feature that hibernate provides for you.
With Seam and JBoss you do not have to use Hibernate. They integrate it and they provide it for you as default in the same way as Oracle container provide toplink for you. So feel free to use whatever you like. I think that Hibernate is a great choice and you can benefit a lot.
There is no fear in the true love!