Great question! I have a backdrop that got given to me as a gift from a place called dropz. They do ship to the USA, but I imagine the shipping would be fairly pricey. My backdrop is made from vinyl and I’ve had no problems with it getting creased provided I store it in the cardboard tube it got shipped in. Because it’s vinyl, it means you can wipe it off if it gets dirty without ruining it as well. Mine is a fairly small backdrop that I more use as the background for stock photography, though I have used as the backing for a video. I haven’t use mine a lot, but it is really handy as far as being able to have a nice background that you can put in position to get good lighting etc. It’s also neat to have a background that you can take anywhere and that you’ll always have! The only problem that I’ve had with mine, is if you are doing stuff that’s too close up I can see the grain of the vinyl. But, it sounds like you’re wanting them for portraits, so that probably shouldn’t be a problem. For an example, you can see some of the pictures I’ve taken with mine here – https://www.lightstock.com/users/creative-clicks-photography/media_items/bible-on-wooden-background
https://www.lightstock.com/users/creative-clicks-photography/shoots/lists
Hope that’s helpful!