Tarantulaspiders.com will pay top $$$ for the following:

Any adult female tarantula with a 10.5" legspan
Any Scolopendra sp. of centipede over a 11" length
Any millipede over 11.5" in length
Any scorpion with a length over 8"
Any praying mantid over 5.5"
Any solifugid with a length of over 5.5"
Any true spider with a legspan over 7.5"
Any tailless whipscorpion with a length over 9"
Any whipscorpion "vinegaroon" over 4"

$$$ to be made here. Inquire if you think you have any of the above and you want to net top dollar for it.