Hmm, I’m not so sure, in my experience DIY often does not work out cheaper especially given the wealth of low cost modules from Doepfer and others, by the time you have purchased PCBs, parts, panels, tools, etc. DIY gets expensive fast and takes a lot of time. If you take say 5 hours to build a module and account for the time where you could have been earning even minimum wage then it is easy to see that small run or DIY building isn’t the financial advantage it may first appear to be. You’d probably be (financially) better off doing a bit of overtime and buying something ready built.
Edit: Of course this isn’t to say DIY is pointless, but I never DIY for sake of cost, I do it to learn and to build things how I want them, and often things that are not available pre-built, etc.