If you're building up your home gym with free weights, tubing, fitballs, etc, try checking with a small local gym or personal trainer for suggestions. Sometimes they get discounts for larger orders and if your order gets them closer they'll give you wholesale price. The equipment is usually more durable and there's a larger variety than big box or sporting goods stores. For a few extra bucks, a trainer (especially new ones) will usually teach you how to use your new stuff too!
I have especially good luck with this tip through my company gym since they are small and don't work on commission. I stay away from corporate gyms who have their own brands becuase they usually mark it up to cover marketing.