One of my main go-to places is theory11. They're more pop culture with their card designs, but they do have decks that could be rivals to standard Bicycle decks that are still really elaborate with some really neat design spaces. Most of their decks run in the $12-$15 range.
theory11 is the largest producer of premium, designer playing cards with recent collaborations with Jimmy Fallon, JJ Abrams, Neil Patrick Harris, and beyond.
store.theory11.com
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TCC makes some really neat stuff as well (the Snake deck, and the Peacock deck that I brought a number of Fridays ago are some examples of their cards. There's quite a bit of Asian designs for their decks, but they have plenty of other styles. Similar price range as theory11, though the gilded edged cards run closer to $25-$30.
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RiffleShuffle (and by extension, Organic Playing Cards [OPC]) has some fun designs. Lots of food-based designs, but the infernal-esque decks that I brought the other day are from them as well. They also sell decks from other companies (NOC, Dan & Dave, and some others). Prices comparable to theory11.
A place where card meets art. Riffle Shuffle Strives to bring more unique playing card designs to life!
www.riffleshuffle.com
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52Kards and Art of Play have a huge variety of deck styes. Prices are kinda all over the map (or at least the ones from 52Kards are all over the map, Art of Play decks are generally $15-$20).
52Kards has been leading resource for magicians since 2011. We create free tutorials and sell a curated selection of playing cards and magic tricks.
shop.52kards.com
A collection of premium playing cards for games, tarot, and cardistry. Our cards are printed with the highest quality paper and feature hand-painted works of art, award-winning design, and luxury packaging.
www.artofplay.com