You should use 2 14 DIP sockets one after the other for the atmega8. By the way, I have bought atmega168 from Adelaida.ro, they were the only online shop in Romania that would sell me just the micro with no minimum sale value. If you are buying stuff for building more that one robot, or you need to add stuff to your electronic toolbox, then I suggest Metrafo.ro, they have a minimum order quantity for each part and a minimum order value of 100 lei, but you won't find anywhere prices so low.
Oh, and as I am moving to Canada, I am selling some of my stuff so I don't have to carry it with me. Send me a PM if you are interested.