It doesn't cost anything to join and the party packs are free. It depends on the party as to what you get for free. For instance, the Sargento party I hosted I was given coupons for free bagged salad, free Sargento Salad Finishers, free Sargento Potato Finishers, salad servers, bowls, plates, forks, napkins, 25 free song downloads, and finally coupons for $ off products for my guests to use.
I supplemented the party pack and bought potatoes, drinks, decorations, etc. Anything else needed to make it a "party".
There is a question when you are completing a survey to be selected for a party that asks how much do you normally spend when hosting a party. Be sure and answer this truthfully. I know some people were surprised when they were chosen to host a party and were expected to purchase expensive sponsor items to complete their parties.
Finally, you aren't trying to push people into buying the product. There is no script or orders or anything. It's really just a fun, casual way for sponsors to get their product out to people without feeling like they are pushing it on you. I love the House Parties!