Help me pick a suspension band/strap set!

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I took a TRX class last Weds and I loved it! I want to get some straps for at home but I can't seem to find exactly what I want.

I do NOT need a set with a book, DVD, etc... (that's why I dont want to get TRX, they're so $$ with all that added in)
I do NOT want a set that hooks into a door, I want to be able to loop it aroud or attach it somehow to the steel cross beams in our basement...
I DO want a strap that's adjustable


Any ideas?

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