Usually companies only go overseas when quantities justify containers. I would suggest that you even stay in your area. I do not know of any near you but I'm sure there are many reliable and ethical plastics manufacturers in the Pittsburg area.
Here's a good resource to search
Best of success
Hi- I am looking for a referral for plastics mass production - will consider both USA and China at this point although I am leaning towards USA (I think that it may make more sense in terms of shipping costs and time). Have any of you worked with a plastics manufacturer that you liked and would recommend? Thanks, Rachel