8. Commitments and Contingencies Operating Lease Obligations and Other Obligations Related to Operations We lease certain equipment and office and retail space under separate lease arrangements. The leases generally contain renewal provisions. Equipment and office rental expenses under such leases for the years ended November 30, 2011, November 30, 2010 and November 30, 2009, were approximately $4,217,000, $2,755,000, and $1,408,000 , respectively. In January 2010, we moved our headquarters and principal executive offices to a facility under a month-to-month arrangement with a third party who provides its product fulfillment, warehousing and distribution services. Under this arrangement commencing in January 2010, we paid a monthly fee of approximately $189,000 for allocated expenses associated with its use of office and warehouse space including its product fulfillment, warehousing and distribution services. Expenses under this arrangement and previous arrangements similar to this one were $2,748,000 and $2,668,000 for fiscal 2010 and 2009, respectively. We lease retail store locations under operating lease agreements expiring on various dates through 2023 or 5 to 10 years from the rent commencement date. Some of these leases require us to make periodic payments for property taxes, utilities and common area operating expenses. Certain retail store leases provide for rents based upon the minimum annual rental amount and a percentage of annual sales volume, generally ranging from 6% to 8%, when specific sales volumes are exceeded. Some leases include lease incentives, rent abatements and fixed rent escalations, which are amortized and recorded over the initial lease term on a straight-line basis. On January 8, 2010, we entered into an agreement to provide us with warehouse storage and fulfillment services and corporate office space on a month to month basis. Under the terms of the agreement, we paid on a per square foot basis for office and warehouse space along with an hourly billing rate for labor associated wit