If you need carp rods, reels, landing mats, nets, etc. it's a good idea to keep any eye out on websites like Carp Kit and Johnson Ross Tackle to see what items they may have on sale. You can pick up some name brand items for very good prices if you keep an eye on their websites.
And it's not just the higher dollar items that go on sale either. If you need hooks, flavoring, fishing line, etc. you can buy them for 50% off (or better) sometimes. I've purchased Korda Wide Gap hooks for 50% off multiple times.
I have also been able to purchase 50# braided fishing line at Cabela's for 50-60% off in the fishing off season as well. I like to go in January. They often have fishing line at very good discounts.