How much the yamaha thr5 +squier cv 50s st Worthy Of?

I just saw a thread selling yamaha thr5 + squier 50s st for 600AUD (about 413USD), and I'm indeed looking for a new amp, but I'm concerning maybe I don't need one more guitar. I might consider buying them if the price is good value for money, but I'm not sure about the second-hand market.