I still would need larger quantities.The paint may be made in China, but it is sold thru Tower Hobbies.The link to Towerhobbies that I provided was just to show an example and some of the properties of the paint that I think would work well on your plastic bumper. I would not buy the paint you need from that Hobby website. They probably wont have a paint to match and, I can guarantee, they wont mix to match. Also, TH is also not located in Texas....Champaign, IL, IIRC.
I would definitely purchase the paint from somewhere else. If it were me, I would buy the paint from a local store. They will usually give you better customer service than an internet store and will even be able to match the color you need. That is why I provided a link to English Color. They were a local store that I used quite a few times and provided a great product with excellent customer service.
