I used to live in L.A and all the petsmarts are outside of the city...there's some smaller petstores within it but they are normally pricy...
This link might help you:
http://stores.petsmart.com/petsmart/...d=NorthAmerica
It will show you the Petsmarts nearest L.A ,California...I know petsmart carriers the kong and I think they carry Cowboy magic but am pretty sure they don't carry petzlife. Have you thought about ordering online?
If your friend is staying at ahotel in the US you could order what you wanted online and have it sent to the hotel. Just under your name on the address put Care Of: and put the hotels name there. Then she could bring your items back and you wouldn't have to pay such high shipping.
Here's your items I found online:
Kong:
http://www.smartpakcanine.com/Produc...d-_-NA-_-11785
Also, if you can get to a walmart, they have a toy there similar to a kong but its in the shape of a fire hydrant and much cheaper, you can get a big one for like $4.00.
Jaden loves Kong toys and has that one and the one from walmart and loves them both.
Petzlife:
http://www.petmountain.com/show_product/511660
Cowboy magic shampoo:
http://www.ablackhorse.com/productca...&idcategory=20
Cowboy magic condtioner:
http://www.ablackhorse.com/productca...&idcategory=20
Hope this helps!