You know, having seen the option you now have, and having read your description of the alternatives, I think -- if I had your job -- I might approach it differently.
I'd look for a knife that either had no real "stabby" point to speak of, or one with a short enough blade that having a point wouldn't be a big deal.
I'd go for a really simple and durable design. Something along the lines of a sodbuster. Or a cheap bushcrafty almost-puukko knife.
If you're working the produce display floor, you probably don't want to be reaching into your pocket, opening a folder, cutting something, and then folding it up and putting it back in your pocket. Repeatedly. Like three times a minute. If you have a standard wheeled produce cart, you could just lay it down between trimmings, but that won't always work. So, a cheap alternative that will do an honest day's job of cutting, hang on your belt, and cost less than $20
including shipping, would be something like the Ahti
Finman, seen here
<deal spot removed>. It's less than $12, and with $6 shipping, you're in under $18.
Now, if the pointy nature of the knife is a problem, then something that looks like a sodbuster might work better. So, I'm racking my brain for a cheap fixed blade that looks like a sodbuster, and it occurs to me that actually a guy could just use an actual sodbuster, provided he had a sheath that would fit it. And then, at the end of the day, he could just fold up the sodbuster and drop it in his pocket.
So I looked for something that might do that and found a couple of things. First, I found this knife. I'm embarrassed to say that I actually own one of these -- it's a great little knife -- and I had completely forgotten about it. It's
<deal spot removed>, about 3/4 of the way down, the #893. The blade is just over 3 inches, it's not terribly pointy, and it's got a nice thin blade that's superb for dealing with produce -- which is what I use mine for at home. Under $20, and with shipping it's right at $25. Serious value. Good quality.
The other thing I found was a variety of leather sheaths intended for use with the "trade knives" seen above them
<deal spot removed>. The third one from the left would probably work with a sodbuster.
Sodbusters can be had cheap. In fact, there are some (imported) Imperial sodbusters that seem to be available for around $10.
Anyway, maybe there is something you can use in my ramblings above.