Eugh, tell me about it. I've a basket on EKWB that's ~600€ and a damned good portion of that is fittings. I don't remember fittings being so damned expensive. I get that hard tubing makes it a little more complex than the ol' barb and jubilee clip, but hot damn. It's enough to make me consider doing a plumbers job and having the bare minimum number of fittings.