You don't need an
rba to try dripping... any atomizer will do. I started dripping with Blu atomizers. Blu with cartridges was such a disaster for me, out of desperation, just tried dripping a few drops directly on the atomizer and then popping the mouthpiece back on and... voila.
For today, you would prefer a bridgeless and usually sealed post atomizer with a drip tip... and you can get both of those from Avid Vapor, Empire Mods, and various other places. Should cost you less than $20 to try out dripping.