I still like RDTA's too and the Faris is my favorite with the Wasp Nano taking 2nd place. Haven't tried the Limitless but I've seen it on sale a lot so...
I have 2 Faris's and found out that you can still get those duckbill valves from the Wotofo site. They don't list them anymore so you have to use the "other" item (or similar. I forgot exactly what it's called) and manually tell them what you want. They used to be like $6 for a pack of 5. Charge yourself $5-6 and see how generous they're feeling that day.
Also, 2fvape has bottles with blunt tip needles and silicone caps that work great on the Faris and are easier on that valve than any of the larger diameter blunt hypodermic needles. And you can carry them without raising eyebrows or dealing with the separate caps and needles needed for a luer lock bottle.
They're like $5 or less shipped for a pack of 5 10ml or 3 30ml.
8 vapes has the Uwell
juice bank on sale for $9.95. It's a stainless steel, glass lined bottle with a needle nose and a pump that dispenses 0.1ml at a time. That's less than half price and a solid piece of gear if you don't mind the 20-30 pumps it'll take to fill a typical RDTA. I'll find out soon enough I suppose.
I use a Faris in RDTA mode on a squonker now and then. It's good when I'm absent minded and forget to squonk enough. Kind of a safety factor. But honestly, I'm about to retire all my rda's but a few in favor of the Profile. Nothing even approaches it for flavor, no matter how exotic the build. Bums me out kinda'.
You can get little 30ml and 15ml PET fake unicorn squonk refill bottles with cheap aluminum 510 adapters and caps with 0-rings for about $2.50 shipped for a pack of 3 on ebay. I got a handful of those, the caps of which also fit common little 10ml bottles for a quick refill when traveling. So far they've held up well and if they don't, so what. They're cheap and unlikely to damage your 510 connection.