Air Filter Supply has a wide variety of filters for every application, they offer custom sizing and always have great customer service.

These guys came through for me. They were able to put together 12x30x1 filters for me very quickly. Same day pickup. Im very happy as nobody else had my size in stock, no Home Depot, not Lowes, not Target, and not Walmart -- nobody. But Air Filter Supply came through big time! I would highly recommend them for your HVAC filter needs!