Cheap price on HD planet earth?

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Was at Walmart today and saw HD planet earth for 90 bucks I think. I want it rather badly, but not 90 bucks badly.

Anyone know if I can snag it someplace cheaper?

Thanks

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I bought my copy from Amazon.com

http://amazon.com/Planet-Earth-Complete-BBC-DVD/dp/B000MRAAJW/ref=pd_ts_c_th_3/102-3115217-6084123?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=right-3&pf_rd_r=0NT0EG00SQW6B7V379TY&pf_rd_t=101&pf_rd_p=278487301&pf_rd_i=193642011