Recommendation has been made to create a sticky for weightlifting equipment since this topic pops up frequently and the workout thread moves fast.
For general weightlifting equipment:
roguefitness.com
elitefts.com
ironwoodyfitness.com
For the 'wei-rui warrior weightlifting shoe' that has been vouched for by sid vicious, here are a few links to online stores that sell these:
maxbarbell.com
quest-nutrition.com
Singlets
http://www.innerstrengthproducts.ca/.../matmansinglet
I will be adding to this list as suggestions are made, and feel free to PM me if there is a link you would like to be put up on this thread.