Time to get a new long distance carrier. We're currently with Sprint but they're kind of expensive, especially for in-state calls.
I found an online long distance comparison
site which seems to suggest that Pioneer Telephone
is our best bet. $0.027/minute state-state and $0.049/minute in-state. Reading the terms it appears that their rates are actually double that but they give you a "50% discount" as long as you pay on time. Interesting. $1/month billing fee if the bill is under $15 unless you do online billing.