Price has to be a factor for me too.
I have an American Morse DCP. Bought as a kit at Dayton in 2010. For the price it is excellent but it needs a base (one is offered as an option). Otherwise it needs to be held down somehow, maybe screwing it down to a clipboard is one method. I have this paddle in a box with my MTR3B.
I also have a Palm mini paddle and it is excellent too. Again, it needs to be anchored to be usable with one hand. I havent sorted that out yet, I bought it very recently. It tends to stay with the FT817 but of course it works with any radio.
The paddle I have used most often in the field is the chinese built model in many of my photos. It isn’t light so it stays where you put it. The adjustment is not ideal, a bit coarse but is good enough for portable work. For the price, not bad value. It seems to have several names but the most common is UNI-730. You will find it on ebay.
I only key at speeds up to about 22 or a tad higher, so a paddle I find acceptable may not suit higher speed operators.
73 Andrew VK1DA/VK2UH