I’ve been pickup up used gear and jury rigging it. It’ll do since I don’t plan to DJ professionally and I like messing around with equipment but it really is a lot of hassle. I just got an old ADJ halogen Vertigo for $30. It fills out my lighting and was worth the price but the downsides are the 15 min duty cycle, it is limited to multi-color lighting rather than single color or color fades, and no strobing.
I think you’re better off thinking about what features you want and buy based on that. If you can get a deal on it, that’s great but cost should influence how much you buy, not what you buy.