Let me be the first to say "Welcome"! You will learn so much from this forum. Are you just starting out in portrait photography? If so, I wouldn't recommend starting with a white backdrop. They are the hardest to learn to shoot against. You have to have at the very least 2 strobes, but 4 would be the best. There are ways around this, but to begin with, I would recommend a gray, blue or brown. Black is all right, but then you might have issues with separating the subject from the backdrop. I have gotten a lot of my backdrops off of Ebay. If you really watch the auctions,you can get some nice ones. There are some controversies on this online place that I suggest, but I have never had a problem with them. It is
www.backdropoutlet.com . If you buy during their sales you can get some really good buys (I got a $400 backdrop for $75!). If you don't have a lot of money to start with, you can always buy a Fantasy Cloth when on sale. I use these all the time and you can pick one up for around $20. The big problem with BO is that sometimes the shipping can take FOREVER!! If you are in a hurry I wouldn't buy from them. A lot of people on here will tell you to stay away from amvona.com to, but once again, I've gotten tons of stuff from them and never once had a problem. I get a lot of their backdrops off of ebay for around $40. There's also an ebay store thats named something like Joe's Photo Auction. I just bought a gorgeous backdrop from them for $80 which included shipping. (They all kill you with shipping!). I hope you can find something you like!