I have had to wear knee supports over many years due to osteoarthritis and find that the neoprene ones are very good. Depending on how much support you actually need, you can get ones with or without hinges. I have used both. However, since I have had both knees replaced, now rarely have to use supports. You can buy these in most sports shops and they are not that expensive, from around £16 for the lighter ones to £24 -£30 for the hinged ones. There are also far more expensive ones, but I found the cheaper ones very good indeed! You can get them with an open patella, if you feel this better. Apart from supporting the structure of the knee, they also keep the knee warm, which eases pain and apparently aids in healing somewhat. Boots also sometimes sell these, but sports shops usually have a better range of them. Make sure you get the right size though, as this makes a lot of difference. Hope this has helped a little and you feel better soon. Best wishes! (apologies, but have copied some of this from another answer I gave on the same subject)