It's not necessarily squier or epi equivalent, but on the USED market you can land a good bit of amps in the $400 range. I got my BLACKSTAR CLUB HT40 combo for under $400. I also got Carvin Legacys for around that as well.
Highly recommend BLACKSTAR HT40. Loud enough to gig or full band volumes, quality enough not to sell/trade it in a year later, tone enough to rock, versatile enough to cover many styles, etc.
I seriously love my amp. You don't have to drop $1K-$2K on an amp, pickup a BLACKSTAR, save some money for other gear and rock out. If I ever get another amp, it would just be another Blackstar with more options like the Soloist.