I make custom-make planters out of decking material and line them with plastic sheeting, so if you have a specific area you'd like a planter for, just ask. Here's the latest ones I made for a customer who wanted to use bamboo for screening and needed two planters to sit on a slope. She painted them black and I think it looks really effective.
After installing an area of decking my wife asked me if I could make some planters to suit the decking and I had a few bits of decking left over so I produced these.
I have lined them with waterproof material. I can make them any shape, length, height, and width – as long as they are made from decking material.
I have also made some raised beds, to reduce bending down and to keep the slugs off the lettuce seedlings
If you like what you see, or you just want to have a rough idea, contact me for an estimate.