To find the equipment, Craigslist.com and look around differnt LFS consignment area's....now on the topic of used equipment. When I buy used equipment I clean every part before using on my tank, I will also try and see if the product works and all pieces are intact.
On the subject of LFS, I spent a full week going through each Fish store looking at thier tanks (seeing how everthing was setup, what equipment was in use, and what the health of each fish was), also talk to the employee's and you will find you novice's and your experts (or ppl that at least can point you in the right direction with out filling your head with a bunch of bs). Find those stores that make you want to keep coming back everyday (I am sure some of these stores are getting sick of seeing me :-P). My other recommendation is look in the main forum and check out ARC's sponser's (these stores in my opinion are the best of the best in Austin).