Ebay is your best bet - I would highly recommend Tokico struts, I own Tokico blues on my MX6, and they are flawless and ride awesome... they are somewhat spendy, but worth every pennie. Next in line i'd say KYB struts, a bit cheaper cost, pretty good ride quality, some people prefer them over Tokico - but its all personal preference, they ride great as well.
Anyways good luck man, my number one thing i'm content with on my car when it comes to aftermarket - is my suspension. The more you spend, the better it will perform and the longer it will last. It was the most expensive investment i've made on my ride, but its also the most important IMO, that is if your car is running well - which mine is (nana)