well if money is an issue, i think it would be smarter to spend $20 like is aid at home depot on a sheet of MDF, desgin a box in winisd or have someone do it for you.. build it (takes a couple hours to cut, over night to dry) and if it doesnt work, you're out $20 but if you do like it.. then you saved how much?
i just changed these subs i got from a sealed to ported.. and i think it sounds alot better.. plus dont forget when you port it.. youll gain 3dbs or more over you're sealed... thats basically doubling the power...