Do you mean buying a grinder from Cama, or do you mean having Cama grind the beans for you in their store?
I’d always, always, always recommend buying a decent grinder that’ll last you a decent amount of time and which will give you a decently even grind. I looked on Cama’s website, and they sell a hand grinder. Is that the one you mean? I have a similar one at home as a novelty, and it does a decent grind for French press. The only real advantage to this one is the short shaft, which may reduce the wobble. You can play with it in the store a bit before you buy it. Extend the grind adjustment out close to its maximum length for a coarse grind (for French press), and then see how much the burr wobbles as you move the handle from left to right. Basically, you want to buy a grinder that will give you an even grind size. You don’t want a wide range of large particles and fine dust. You want your ground coffee to be mostly the same size. If the burr wobbles around a lot, you won’t get an even grind, and your coffee won’t taste as good.
The Feima 600N retails anywhere from NT$2,500-3,000 and is worth it, even though it’s fugly. It’ll grind for most of your brewing needs. The Porlex I mentioned should be around NT$1,500, but it’ll only be good for Aeropress–maybe Kalita Wave–but not French press. The Hario Mini will be similar to the Porlex, and the Hario Skerton suffers from the burr-wobble problem I mentioned above. Otherwise, you’ll have to dish out a bit more money.