What r my option to put 2 12 inch subs in my Honda prelude?

i have 2 12 inch TMX subs and the box they r in won't fit in my trunk and i want to put them in the trunk but i don't know my options the only option i have found is getting a costume box for 225 but i want to know if there is a cheaper option so if u can help me out please do and thanks to all that help me out