Fixed your thread title for ya
I assume you mean you're looking for a good carto tank? Your options are wide open no matter what your price range. All cartomizer tanks will essentially perform the same, since they are nothing more than a reservoir for liquid. As long as the o-rings seal well the performance aspect will be entirely dictated by the cartomizer inside and the size/number of punched holes.
Here are a few under $20 options:
Cartomizer Tanks
DCTs - Tanks & Clearomizers - Atomizers & Cartomizers
DC Tanks
There are many, many others out there. Some are designed with the intention of using flanged cartomizers, but this is usually not a requirement and any cartomizer of the right length for the tank can be used. Personally, I prefer a single-coil cartomizer to a dual-coil, I find the flavor and overall vape to be better with a single. As for brand, I usually get Boge and occasionally Smoktech. YMMV
Hope that helps