I know, i made a similar mistake with an Dash Miner D3 in the beginning of my journey, but the overall loose for me was $200 at the end.
And now after 7 years of experience i warned very often -> don´t fall into this trap, if something sounds to good to be true than it isn´t true or it is too late for you.
I was in the same situation before I got D3 units not directly from the manufacturer, but through someone who sells 2nd hand/used units. I never made a profit, so I made the choice to sell it to others at a low price with a negative return. The profitability of this unit before is very attractive forcing you to buy it.