Triathletes swim, bike and run, and it's all in a day's work. But even for non-triathletes, those three sports can be expensive. And those expenses aren't limited to active adults. Kids on swim team need new suits and gear each season. Cross-country and track runners need shoes, socks and apparel.

Forget about fashion: It's hard to get around the need for new purchases each season, and those reasons rarely include keeping up with trends. Swimsuits need to be replaced frequently because chlorine causes rapid wear and tear. Bikes frequently need new tubes or other parts, and a visit to a local bike shop can get spendy. And experts say in order to avoid injuries, runners should replace their shoes every 500 miles (at least once a year for casual runners and sooner for runners logging longer miles).

Websites dedicated to all three sports are loaded with deals that make it realistic to keep up with gear that needs to be replaced each season. And with the holidays around the corner, they are a good source for those active loved ones on your gift list.

Swim

Swimwear is the focus on SwimOutlet, but this site is also loaded with other gear and apparel for active individuals. Get apparel for running, cycling and yoga, along with an array of swim accessories (goggles, caps, gear bags, flip flops, beach accessories, pool toys and more). The site has deeply discounted prices for swimwear, but the best deals are found during clearance sales when items are marked down up to 80% off regular prices. For those who are extra adventurous, be sure to check out the Grab Bags: These sales offer heavy discounts on swimwear, but the buyer doesn't get to see the color or print. The items are listed by brand name and type (a TYR one-piece racerback or Nike two-piece, for example). Customer reviews make it easier to buy here because of feedback that helps predict how a suit will fit and how it holds up to frequent use. The site has suits for men, women and children, and it's a good place to find swimwear for kids needing items for swim team.

Bike

Cycling enthusiasts will find everything they need on the daily deal site called ChainLove. The concept is similar to other daily deal sites: A deal is posted each day and it's available in limited quantities, while supplies last. When the deal sells out, they post a new one, so often there is more than one deal available each day. In addition to bike components, tools and gear, deals also include apparel. If the current deal isn't appealing, be sure to check back soon because the products offered here are diverse and can include nearly anything connected to cycling, from socks to seats. Save the rapid heart rate for those steep hill climbs and stop overpaying to fuel that cycling habit!

Run

Runners can be competitive, and that comes in handy at Running Warehouse because these deeply discounted running shoes move fast! The site features closeout deals and heavy discounts on running shoes, and each product listed has a corresponding number that reveals how many are in stock. It's hard to ignore a killer deal on running shoes when there is only one pair remaining in a specific size. Shoes are categorized by function (neutral, stability, support, trail, etc.) to make it easy to find the shoes needed for a specific running style or preference. It's also a good site for students needing track shoes and spikes or cross-country shoes. A handy shoe-fit guide makes it easier to find the correct size, but they also have a user-friendly return policy to make purchases worry-free. Gear, nutritional items and apparel are also sold here.