I've seen prices up to 100 euro (I only looked at stores in my country).
The one I picked did it for free: https://www.aios.be/ (local store, very good service).

2 years ago: DVD-RW LG GH24NSC0, Corsair Vengeance LPX 16GB DDR4, Asus Z170-A, Cooler Master Hyper 212 Evo, Intel Core i7 6700, Corsair RM550x, Samsung 850 Series Evo 250GB, Fractal Design Define R5 Titanium
I then installed myself: 2 SATA HDDs (3TB+2TB) from my old system, and a GTX970 that I bought second hand.

I could've built it all myself, but I don't want to.

Out of curiosity, why the optical drive? Have you actually used this DVD-RW drive on the system you had built?

(My current desktop, which I built myself, doesn't have one, and I haven't missed it.)

Because I have lots of boxed games, music CDs, DVDs. These days, I don't use the original medium that much anymore, but I still rip audio CDs to FLAC regularly.

I'm always going to have/want a drive for my discs.

Xidax is amazing

I don't use it as much as I used to - but I wouldn't call it a "rare case". So for now I can live with its 2W idle power usage.


I still miss boxed game releases! (with at least a manual/documentation inside)

DIY, but if you value your time (or rather the lack of it...) and go for higher-end systems, here is another vote for:
https://www.overclockers.co.uk/

It may not be the cheapest, but superb service so far - they are PC enthusiasts themselves and machines built to order are soak tested.
Plus considering the prices of higher end components, you should definitely go for a service where they know what they are doing - if anything goes wrong you can easily lose a lot of money on your DIY.

iBuyPower & CyberPower are popular & economical. I've heard horror stories about each though: fans in the case - just sitting & not actually hooked in to anything, shards of plastic with no known origin, things like that. My own CyberPower didn't start when I first got it because they forgot half the components in the computer, so I had to go back to Best Buy & exchange it for another one.

On the other hand, given it actually works now, it runs pretty great (though I don't play many new games, certainly not on Ultra settings). My cousin (who bought iBuyPower) saved a bunch & wasn't a heavy gamer, but loved it & said it served him well for many years.

Given how this stuff goes down, I purposely opted for a physical location so I could go back & return it in case something was wrong. In other words, I think the company itself doesn't matter as much as resolving the issue if it comes up - any big company or brand is bound to have loyalists & haters for any number of reasons. If you have an issue like mine, you don't want to be shipping everything back & forth several times.