Cost of T3 vs T1

$800 per month for T1 vs $15,000 per month for T3.  "The most significant differences between T1 lines and T3 lines are cost and speed. The typical T1 connection costs approximately $800 per month while a T3 connection can cost as much as $15,000 per month. T3 lines are extremely high bandwidth connections into a carrier's backbone. They typically include SLAs (Service Level Agreements) that guarantee uptime and performance."  (Luba Yelovich-Sakharuk, "Performance of a T3 link," CS 577  Term Project, Worcester Polytechnic Institute, Department of Computer Science, Email: cs@wpi.edu, 100 Institute Road, Worcester, Massachusetts 01609-2280, 508-831-5357, Spring 2005, p. 9)