Booster seat help?

Irisheyes1247

Ok, so we are going to a friend's house tonight for dinner, and I was thinking of getting a booster seat. This is something I have been mulling over for a while, it is just timely to tonight now. Should I spring for the Fisher Price space saver high chair ($60) http://www.toysrus.com/product/index.jsp?productId=3867646 or can I get away with just the booster seat like this for $30: http://www.toysrus.com/product/index.jsp?productId=3553506