Second hand mining rigs are now available at much cheaper rates when compared to the new ones, and depending on your limited funding, this may be the best option for you. But always remember that the old rigs can be more power-consuming, more prone to over-heating and most importantly they can have a significantly shorter lifespan.
I agree with him. There are lots of second hand mining rigs available used for 2-3 months, since people stopped mining because of low profitability. Or try to find second hand gpu's from gamers.