Help please

I have a few special products that require a $35 service charge on top of the product price.

1. is there a way to do that.
2. is there also a way to waive that price if they order $35 worth of other products on the site.

Thanks in advance.

Chad

P.S. The forum and Zen cart are wonderful.

Using Zen Cart 1.3.8a
Database Patch Level: 1.3.8