What's the exact amount they're asking you for, as a percentage of the purchase price? Because you need to figure out if we're talking "normal" fees or if you got ripped off.
Okay, the others told you right: the fee schedule is set by the State and hasn't changed in years. It's actually heavily regulated, so no notary can really give you a discount on their base fees. But what's probably changed since you were looking at forums a few years ago is mainly the price of properties going up (especially in Île-de-France, ouch), so the fees in absolute value are higher even though the percentage stays the same.
What nobody really tells you enough is that on your invoice you're going to have stuff that's really fixed (the notary's fees), but also disbursements - file fees, formality fees, cadastral registration, etc. Some of these disbursements can vary a bit from one notary to another or depend on how complicated your file is. Before you sign, ask your notary to give you a detailed breakdown and also ask if there are any fees that could be reduced or eliminated if you do some things yourself (like searching for legal history). It's not always worth it in terms of time saved, but it's worth checking.