A "good deal" is anything that makes you happier with the object than with the money. The money can always be replaced; these objects often cannot.
There is no "market" in 8 inch turntables, meaning they come up for sale pretty infrequently. There's a limited supply, but also a limited market.
If I needed an 8 inch turntable, I'd be all over this like ugly on Alec Baldwin. Be aware, however, that if you have the brake that presses UPWARD against the underside of the turntable, this isn't the turntable for you.
Good luck!
George P.