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Thanks for the heads-up on Custom Amp Covers. I live in France, so shipping and customs costs should be less. Bulgaria still has to use its own currency (like Poland and the Czech Republic) and not the Euro, but they are in the EU, so hopefully, no customs fee. I asked them for quotes for covers for my Rumble Studio 40 and my Native Instruments Komplete Kontrol S61 MkII keyboard.Based on recommendations herein, I searched cover makers' web sites. I ended up going with Custom Amp Covers because they offered the most bang I needed[1] for the buck. Inspired by Yelena Romanov, I asked, and they were happy to add a cable pocket at $10 per cover.
The only surprise was when I saw the shipping cost. I dug a bit and realized then the covers would be coming from Bulgaria. That's fine, it just upped the cost some, and means it will take the covers longer to arrive. I still bought two (one per R100). I'll review them soon after they arrive.