I was looking for it myself today and came across this? Hope you find what you’re looking for! Cowboy Bebop The Movie - DVD https://www.amazon.com/dp/B07FDH2JN8/ref=cm_sw_r_cp_api_i_KLrCFbB1HDE0W

EDIT I just realized this DVD is region specific and will not play on most DVD players sold in the U.S.