You can find a Blade parked in front of a garage of a house east of the safehouse in El Corona, Los Santos. Also, they can be seen driving in San Fierro Rifa territories, such as Doherty, Garcia and Battery Point.
The Broadway can be found driven by Varrios Los Aztecas members, in El Corona and Little Mexico, Los Santos. Also, there's one parked next to a gas station in Idlewood, Los Santos.
If you need one for Exporting, one can be found in Unity Station, in Little Mexico, Los Santos. Also, it can be seen driving around Grove Street, which is the one your first house is located. It is also commonly found in Dillimore.
The Savanna is commonly driven by members of the Grove Street Families, so it can be found around those territories. There is a house west of Loco Low Co. in Willowfield, Los Santos, where you can find one. After you complete the "Customs Fast Track" mission, you can find one parked inside the second floor of the Wang Cars showroom.
If you need one for Exporting, one is parked in El Corona, Los Santos, at the rear entrance of the sex shop. After doing that, you can import it from Easter Basin on Saturdays for $15,200. You might be able to find one driving around in Prickle Pine or The Strip, Las Venturas, or in Downtown or Market, Los Santos.
The Tahoma is one of the gang cars used by the Ballas gang, so you can expect to find them driving around on their turf, which includes Idlewood, Jefferson, Willowfield, Glen Park and Verona Beach, all in Los Santos.
There isn't any known location where you can find the Tornado parked. However, you can find it driving around in Los Santos Vagos' territories, which includes Las Colinas, Los Flores and East Beach, Los Santos.
You can find a Voodoo in El Corona, near Cesar's house. Also, you can also find it driving around in Grove Street Families' territories.