I bought this on amazon in a pack with other ships back in 2016:

https://www.amazon.com/gp/product/B01D5OPNLS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

These are a soft alloy and they all broke after awhile (took 3 years though). The star destroyer and serenity probably lasted the longest. Slave one and enterprise broke apart pretty quickly if i remember correctly