There are many diy wedding arch plans that you can try out. You can buy sticks such as bamboo and make one on your own or you can buy a metal arch and you can decorate it on your own using red, pink and white roses. You may also rent a metal arch from a rental company cheaper and you can decorate it on your own. You will get a beautiful look of fall but at the same time you will be in the budget. You can buy beautiful birch poles which are available at the market. When you have already bought the poles, you may attach them using own flowers with clear fishing thread and in this way you can enjoy an arch at a friendly budget.