Buying Seeds

I know all have heard this question posted by a lot of people prolly, but im new here. Other than nirvana seeds, what other seed companies ship safly to the USA? and have you gottten seeds from there yourself?
Im trying to buy some lowryders, but nirvana doesnt have those, or at least i cant find them anyway? Please help

Nirvana is the greatest ever, Stick with them you really won't need anyone else. They have been in business the longest and are the cheapest. Just stay with them.