Here is a step by step guide on building raised garden beds from old pallets. We use this way of building raised beds a lot in our garden because it is as good as free and quick to build.
It is easy and simple to do. Anyone who can handle a hammer and a saw can build one of these in no time!
These beds are surprisingly durable. Some of ours are at least 4 years old and are still as good as on day one! Cover them with hoops and some floating row covers like these and you will have a raised bed producing vegetables for you for most of the year.
You can get used pallets from builders providers or garden centres. Make sure to get untreated pallets. There is a code on the side which will tell you if the wood has been treated with toxic chemicals. In Europe they are generally untreated but of course they could also be imported from other countries.
So be careful with your choice of pallets for your vegetable beds!