You must have been looking in my shop window! I just upgraded my Prusa Mk3 to a Mk4, and ordered a roll of filament and one of the satin print sheets from Printed Solid. You are right, the base prices are a bit higher but the shipping is a lot lower, so its worth it to check both sites for what you are ordering and see what the difference is if you are in the USA. Order shipped quick, and arrived in two days. Here also, I have no connection to either company, just an end user. It would have been nice if the prices were closer to what Prusa directly sells at, though I can see it being a little higher since they have to get shipments in. The shipping for a small order from Europe can be a lot, nice to see a more local source. The sellers on Amazon and Ebay are way too expensive.