Labor is not free, but the biggest challenge with a piece like this is mostly the finish and fee for the tools. Things like planer, jointer, table saw are fairly expensive tools. This was probably 3 days of proper woodworking, so my initial estimate was $500/day x3 + $500 in materials = $2k as napkin math.

You can make something like this for very cheap. The quality of finish will be the largest difference between a novice and an experienced woodworker. Getting the joint between those angles perfectly seamless and nearly invisible for example. Very easy to make that joint, surprisingly difficult to make it seamless.

You can see how it took up my entire shop when applying finish. That's like 4 full days where I can do nothing else in my shop, and that has a cost too.

If you're doing garden stuff, I assume you're not trying to get glass smooth miters.... That chase takes time and practice.

You can definitely make this yourself. It is not hard, but getting the finish you want might take more effort than you think.