You are lucky they still had stock - they were from a few weeks ago!
Currently, they have ratchet straps and may still have stock of ratchet pruning secateurs - a very powerful one-handed tool to wield when up a ladder collecting a swarm from a tree. Aldi will be having similar ratchet secateurs soon, but charge slightly more than Lidl ...
The luggage scale. Don't wait until Autumn. You can use it to track the weight gain as nectar is brought in.
And you want to build up an idea of what your hive hardware weighs, so that you can work out the amount of stores from the total weight.
Add a hook of some sort to the middle of the left and right sides of your hive floors, allows you to weigh one side at a time (just add them together) which is much easier than trying to lift the lot from a strap.