The JBL Lim Collect lists at 7.67 Pounds/ $13.75 at todays exchange rates. [1 British Pound (GBP) = 1.7911 US Dollar (USD) and 1 US Dollar (USD) = 0.5583 British Pound (GBP).]
A veggie bait lures snails in. Unfortunately it also caught other stuff which had to be freed before they came to harm.
The Snail Harbor for 8.95 Pounds/$16.00 included packing and postage in the price, although I'm sure that is for the U.K. It seemed simply put together but efficient.
I'm not sure that a clean jar or small bowl baited with lettuce, cucumber, zuchinni or an algae tablet wouldn't be about as efficient if one empied it every so often. And if you like loaches ... ;)
In addition to a pest trap, designed especially for marine set-ups, they showed a couple of fish traps. Both gave the impression that the aquarist had to hold a trap door open and release it "just now!" which might be after a couple of hours!
They cost up to 25 Pounds/ $45. That makes an old fashioned net or even two in tandem seem pretty reasonably priced and efficient. ;)
There have got to be better fish traps available through the bait industry.
Catching dangerous pests like mantis shrimp in marine set-ups or fish out of well planted tanks or aquaria with huge rock piles makes such live traps a good idea.
Still... back to the lab guys.