Credit cards!!!
As shared by reefers here, credit cards (or other plastic cards) are good in scrapping off the stubborn green spot algae on tank glass.
What exactly are you looking for? Quality? Pricing? Convenience?
Other than LFS, you may just wait for reefer's sales thread, possibly cheap and good...
It needs luck to get cheap yet good 2nd hand equipment.
I honestly don't believe one can have that much luck to have everything cheap n good.
So make sure you understand the risks involved