It's been a while, so hard for me to say exactly.
Liner was around $150
Wood was another $150 (approx, maybe more)
Screws, foam, and misc were another $50 easy
Pumps, Heaters, and Filter stuff I had a lot of but if starting from scratch you could spend $200-300 and have about the same stuff I did. (Which was approx 1,200 watts of heat if I recall right. And about 1,200-1,500gph worth of pumps)
With no top it lost heat fast, so the heaters will be on a lot too. Factor that into your monthly electric as well.