If you have fiber to your home from a local ISP, can you convert it to a business account for using it for a WISP? (Comcast offers fiber/2000 Mbps in my area)
Tack a 0 or two onto the monthly cost, and possibly. Comcast (and most other large ISPs) contractually prohibits you from reselling either residential or business connections, so you'd have to negotiate something else.