More carp specific, boiles, baits, and the like.
To be honest...the best tool is....google. Search for "carp bait" and check out the photos, videos, etc. After you narrow down your top 3 favorite items of interest, start searching on those specific items when you're ready to purchase and choose an online retailer. I've been using BigCarpTackle and I've had nothing but stellar service from them.
But c'mon.....the most fun you'll get from Carp fishing regarding bait...is making your own. I pressure cook my field corn (maize) and add flavoring and I have enough bait for a few days fishing in around 2-3 hours. I also like using grocery baits like cereal, muffins, making my own dough bait, nuts, gummy bears, bread, sweet corn, hot dogs, etc. Now...when I do a serious outing on a large lake, reservoir, etc, I chum with the field corn and use pop up boilies for the hook bait. But in smaller lakes, community ponds, etc, I use light line and store bought baits. Soo much fun.