Looking for decent mining hardware under $600

The title pretty much sums it up.

If you mean hardware that is meant to earn a profit -- NO. Now if you just want to play the lottery by solo mining then there is this https://bitcointalk.org/index.php?topic=5355470.0

S9 for 580 with a psu will turn a profit if you have cheap power. https://www.ebay.com/itm/234282160679? I have zero idea if the seller is any good. I have zero idea if the gear will work. But it earns 38 cents a th and does 13th or $4.94 a day if  you have 10 cent  power it burns  3.12 a day so 4.94-3.12= 1.82 a day profit. but if you have 20 cent power it burns 6.24 a day so 4.94-6.24 =  1.30 a day loss.