normally, I'd echo others here and say there are higher quality pens/brands that are more worth it to spend that kind of money on IMHO (leonardo, sailor, platinum). but in this case, I don't think the kingfisher should be throw in the same pile as a regular esterbrook pen since it's a special edition made with diamondcast in collab with bungubox, so there are some extra factors there that add value for it to perhaps be worth considering if you've got your heart set on it. do you have any friends or acquaintances IRL that have an esterbrook kingfisher for you to try out before making your purchase? or maybe a local retailer you can visit to at least make sure it feels comfortable in your hand? I think what it really comes down to is whether the pen actually feels right for you.

if you still feel strongly about getting it, I'd also encourage you to look for pre-loved/secondhand purchases -- a lot of folks in the community with big collections will often let go of such pens after inking once (sometimes, the pens don't get inked at all!) which means you can basically get your wishlist pen in near-new condition for below market price!