It’s $1000 to collect some semen and have it frozen for a few years (Reprotech is a cryoprovider I can recommend)). Vasectomies are cheap (<$1000 but free in a handful of states). Bank the tissue and get snipped is my advice. Buys you an option if you change your mind (call for a specimen and do IUI) but firmly insulates you from mistakes or decisions made under suboptimal conditions.