I would imagine you could still do it, but back in the day you could pretty much call up the Gateway shop, say I want a box of 5 or 10 wizards or whatever, give them a description of what kind of feel you like...firmer, softer, smooth texture, chalky, gritty, or whatever and they'd go pull stuff off of the racks and send them to you.
Gotta figure, those dudes are gonna as familiar as anybody else when it comes to fondling wizards. And in my experience always enjoy nerding out about plastics too. I'm lucky enough that I'm local, so every so often if i need some fresh wizards I'll just go direct to the source and feel a bunch up.