Aqua-Tech filters can be found online though Amazon or one of many online shops. Walmart and Petsmart stores across the country carry Aqua-Tech products as well, and there's a good chance local aquarium shops carry this popular line of aquarium products.
Aqua-Tech is a popular and widely available brand of aquarium equipment that produces a variety of fish tanks and accessories at economical prices. If a person is looking for a specialty filter or something out of the ordinary, researching online availability may be a good idea. Searching online stores like Amazon will result in the largest selection and stock variety, and this can be less expensive than a pet store thanks to low overhead costs.
Purchasing a filter in-store (especially in a specialty aquarium shop) gives a person the advantage of discussing any special needs with an experienced specialist. An in-store purchase at a local shop also makes returns and exchanges easier, should they be necessary. Used tanks and filters are often available in thrift stores, and even local Craigslist can be a good resource for those setting up a fish tank on a budget; people who have given up the hobby or moved on to different equipment often list these items free.