Very, very seldom do roasteries roast the same bean to different levels/degrees. Usually they buy a bean and roast it to the degree they like, but they roast another kind a little differently because it brings out a different flavor. Only if they want to do a presentation to the public would they roast the same bean different ways. Find a local coffee shop with experienced and friendly staff and start talking to them about coffee. However, the only coffee shop I’ve ever heard of doing this on a regular basis is actually here in Taiwan, but in Taichung. It’s called Orsir, but I have some issues with their roasting and prices. I don’t discourage anyone from trying them, though, but maybe only after a person has more experience first. They use their own rating system–M0, M0+, M, M+, M1, and M2–where M0 is light and M2 is very dark.
I’d suggest simply going to your regular place where you buy coffee and showing the worker what you usually buy and then asking if it is a light, medium, or dark roast. Then point to another one and ask if it is lighter or darker than what you usually buy. Explain that you’d like to try something a little different, but not too different. They’ll ask what flavors you want in your coffee, and that’s where things can get tricky. Ask them to describe what flavors are in some of the different beans and see if anything interests you. They’ll most likely ask if you can “accept a little sour” (lighter-roasted coffees will taste “brighter” or more sour than darker roasted ones). I’d tell them you don’t really know, so don’t give you anything too sour. I’d buy a small bag, usually 225g, as an experiment. Next time you go back, try to talk to the same person if you can and use your experience from your regular coffee and the experimental one you bought last time to find something different. Keep doing this, and don’t be afraid to look a little foolish. I’ve said, and still say, some pretty dumb things in front of coffee people. In Taiwan, they usually smile or chuckle and try their best to help you. You may be surprised how much the workers at these places appreciate enquiries and enjoy talking about their offerings. However, if you find the workers can’t really answer your questions or help you, you may want to find a place that can.
Cama is a franchise, but I believe they’re somewhat decentralized. I think each location does their own roasting, so, while they may use the same bean and the same make and model of roaster and try to follow the same directions, there may be slight variances between locations. My only experience with their cappuccino was not great, but it’s quite likely their beans for brewed coffee are fine. I say give them a try, but don’t limit yourself to just one coffee shop. Buy a couple times from one place to get a feel for their style, then switch to another place to see what they have and what their style is like (other than simply another Cama, of course). I really suggest buying in small, weekly quantities and experimenting a bit.
In Taichung, I’d expect to pay at least NT$250 for 225g of coffee from a decent coffee shop, but I may have to pay up to NT$300 for something I liked better. There are, of course, coffees at NT$350, NT$500, NT$900, and even higher, but I wouldn’t go over NT$350 myself unless I was buying something for my parents or someone special to try. Places like Cama, and OKLao in Taichung, may be cheaper, but you’d have to compare their coffees to other places to see for yourself if the extra money is worth it. I imagine the prices in Taipei would be more expensive, but I don’t know to what degree. (I’m sorry I can’t be more helpful in this regard as I roast my own coffee and I’m a little out of touch with the prices of roasted coffee, especially in Taipei.)