AHRE has a fabulous sale every August - one ounce samples are $1 each. They also throw in two free 1 oz samples with every order. I have liked many of their scents
Peak and Candlescience, already mentioned, have deals periodically, on Peak I've seen 10 for $13.99 from time to time and they sell in glass bottles too.
I've had relatively good luck with Peak, less good with CS.
Southern Soapers now has sniffie vials like Elements. It's enough to scent a single small bar (2-3 ounces) if you want to get an idea of how it will perform in CP.
Oregon Trails also has a sampler but depending on what you order, it may be cheaper to go a la carte. Their samples are 2 ounce size. I've liked almost everything I ordered from them.