Having trouble finding a 4 season tent?

As a geology major, over the summer I have to go on geology field camp. this includes living out of a tent for 6 weeks straight in every weather condition possible in CO, NM, TX, UT, and Montana. I know that I need a good 4 season tent and after weeks of research I thought I had found "the one". The Chinook Cyclone 3 got awesome reviews online and is very reasonably priced. There's just one thing... I can't find it available online ANYWHERE. What do experienced campers recommend? I am not looking to spend over $250