Hello Zlzyx! Welcome to the forum. I'm a newbie my myself, got hooked on the expansions a couple months ago and I'm nearing (what I would consider) completion. I know you're only asking about the first 10 expansions, but please consider all the strange and beautiful mini expansions and add-ons.
If, like me, you're more interested in play and game mechanics than just collecting, I have a couple suggestions:
1. Try out some of the expansions first virtually on either the Carcassonne app (I use the excellent apple mobile version) or the equally excellent
http://jcloisterzone.com/en/2. Read the element index reviews on this site and see if they jive with your gameplay style. I prefer expansions that enhance the aesthetics and cooperation of the game over elements that simply add points or complicate the scoring mechanic. You can even break up existing expansions into the elements that you're interested in. For example, I just ordered the castle tokens from
https://cundco.de/en as a separate element from the "Castles, Bridges, and Bazaars" expansion. I've also ordered phantom pieces, the school, and abbot meeples. I recommend making one combined order to save on shipping costs.
3. If you're in the US, you're going to spend most of your hard earned $ on shipping costs as many of this items come from Europe (especially if you're interested in the old edition artwork). You may be able to find some great deals in Canada or Mexico though (perhaps you can ask a friend to pick something up for you?):
mercado libre or
www.kijiji.ca.
4. Lastly, try the reddit monthly boardgame market:
https://www.reddit.com/r/boardgames/comments/815ih1/the_monthly_board_game_bazaar_march_2018/I have some extra expansions to sell as well. I'll send you a private message if you're interested!
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(or just ask nicely)