There is a sports shop on Stapleton Road that I popped in the other day to buy a skipping rope. The owner is closing down and he does half-price discounts (or near enough) on everything he's got. It's called Venom sports and it's between Newton Street and Milsom Street, opposite Easton swimming pool.
He seems to have a bit of everything. He's got mouth guards (he seems to have a great deal of gear for Boxing and he himself plays Badminton and something else rather), he's got a set of outdoors quad wheels, some hard-cap knee pads and loads of coaching equipment like cones, bibs, stop-watches, and so on. He probably has also lots of fitness equipment for those who want to do the extra work-out at home. I didn't browse the whole shop in detail.
If you're interested, pop in shortly as he will lock the doors forever within the next few weeks.