No, Geeksquad doesn't help you purchase devices from the floor at all.
They "repair" PCs. They DO upsell overpriced unnecessary "solutions" for devices that you bring in though, so I guess they do "help you purchase stuff."
I personally just joined today because I finished watching all of the recent LTT videos as well as ChannelSuperFun. My new favorite tech source thanks to the personalities.
Not sure if this helps you, but I'm a new (planning to be) regular.