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Um. It's not gonna work unless you have the watch brand it came with. Un-coded means un-standardized which means un-interchangeable.
As others have said, they all work IME. I've got a couple of really cheep ones and a polar one. They all talk to each other and to the equipment at the gym. The only one that they dont work with is concept2 rowers which for some reason went against what everyone else had done and use ant+.
As for the original question, I've not seen a standalone cheep 'watch'. My polar F7 was about £25, and my mum's got one from Tesco which works just as well, but both came with belts.
They won't always work, and there will be no way of knowing ahead of time. This is a moot discussion though, because un-coded HRM's are always el cheapo (<$30) and always include the belt anyway. So if you're looking for a $10 watch without belt, then just find someone on e-bay selling the watch without the belt.
Un-coded just means that the heart rate signal is directly modulated on an RF frequency and then demodulated by the receiver, without any sort of encoding scheme to prevent interference. The signal power and RF frequency between manufacturers can differ which would make them not work. Since 99.9% of them will probably operate at unlicensed frequencies of 900Mhz or 2.4Ghz odds may be pretty good that they'll work.
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