lowes.com offers the Werner 13-Foot Aluminum Telescoping Ladder, model no. MT-13, for about $120.00.

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http://www.lowes.com/lowes/lkn?action=productDetail&productId=78390-287-MT-13

Order it online for in-store pickup; otherwise, shipping adds around $75.

It features a 300-pound weight capacity, 13 adjustable working heights or positions, and conversion into four "different" ladders.