What does an unlimited traffic residential IP cost?
Static Residential ISP proxies start at $15 per 25 proxies, which is $0.60 per residential IP with unlimited traffic included, stepping down by volume to $0.44 per proxy at 2,500+. Datacenter proxies start at $8 per 25 ($0.32 each) and step down by volume to $0.14 per proxy at 5,000+. Either way the discount ladder is attached to proxy count, because there is no data component to meter.
So a 25-proxy residential pool is $15 whether you use it for a handful of daily checks or a continuous scraping job. The only lever that changes your bill is how many IPs you hold.