I'm thinking of doing a science party for my son's sixth birthday as he loves doing experiments. I've contacted a few companies and the prices seem to be between £200-250 for an hour. Whilst I'm not quite as tight as DH (who said he didn't expect to pay more than for a facepainter) it seems very expensive. If you've done one, was it worth it? There isn't the option to pay on a per child basis. I was thinking of inviting about 8 children.
On the other hand although the price is high I suppose it could easily cost nearly that much doing a large party at soft play or trampolining.
I know I could set up some experiments myself, or for that matter just have some of DS's friends over for tea, cake and a couple of party games, but get very anxious at the thought of supervising and entertaining multiple children.