Costco gives you an extra 1 year beyond the Manufacturer's typical 1 Year warranty.
Many credit cards do as well, if you purchase with a credit card.
Square Trade is excellent.
Walmart offers Extended Warranties that have been solid as well, but Best Buy is probably a bit better as when they do trade ins, there is more selection.
Epson 8350 / Panasonic AX-200u / Optoma Graywolf 92" / Draper Luma 92"
Samsung 51F8500 / Panasonic P50ST60 / Vizio P502ui-B1E / Sony 50W700B
Sony S790 / Panasonic BDT-220 / Roku 2 XS & Roku 2
Sony NT5 / Samsung F550 / Speakercraft CS3 / Yamaha YAS-105