Brilliant online tool - high quality components
Yes, it's possible to buy cheaper Chinese gas struts from Amazon. But the online tool that GasSpringShop provides is simply perfect. They've done a clever thing in not revealing the force rating of the required struts until after the order is placed and dispatched, so you can't use their tool and then buy cheaper struts elsewhere.
So, you get what you pay for. Immediate delivery, very high quality components with detailed drawings and dimensions. Having already done the calculations with the online tool before I ordered, I installed them according to the measurements supplied and they work flawlessly (eerily similar to the 3D visualisation they supply in the tool).
If I ever need gas struts for anything again, there's no other sensible place to look.