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It seems likely that nobody here has ever heard of a <$50 lav mic that could be characterized as "good".
Please explain how you want to use this, or in particular, what you want to connect it to?
Are you looking for 3-pin XLR? 1/4" phone plug? 3.5mm mini-phone?
Self powered (battery)? "Plug-in power" (~5V)? Phantom power (48V)?
I've used a $3 "computer mic" plugged into a 3.5mm mic jack on a little camcorder with good results. You can break the conventional rules if you know what the consequences are and are prepared to deal with the consequences.
If $50 is your budget, then rent a good device.
OK. $100 budget. What do you suggest?