Are you looking for a case (48 cars - 4 full sets of Street Freaks) or an Inner (12 cars - 1 full set of Street Freaks)? There are a few places to get them.. all about the same price, mostly shipping is the big difference - it can run from $6.50 to as much as $21.00 I saw at one place.
Mac's Little Cars doesn't carry the Street Freaks right now, but we would be willing to special order you in a case or inner if prepaid and all White Lightnings received in are sent out in orders whether its 1 car or a case, none are pulled, culled, yanked, reserved, raped, stolen or otherwise removed from any inners or cases except to go out in an order. Shipping would be like $6.50 for an inner and $15.00 for a case.
There are a couple of others here, but I will let them quote prices and shipping to you.