Awhile back, I came across this very interesting article from The Reformed Broker.Essentially, the author mentions that one of his favorite tricks of coping with a severe market correction is to identify stocks that he would love to own at the right price, identify what would be an absurd price, and then enter good-till-canceled (GTC) buy orders at those prices.It occurred to me that one can do the same with quality ETFs. Here's the little wrinkle that can make ETFs interesting. While this does not happen often, on extremely volatile days ETFs have occasionally been known to suffer from temporary price dislocation, when the price of the ETFs temporarily trades at a lower price than the value of the underlying assets. Even if this does not happen, having GTC buy orders locked in at prices at which you would love to buy certain ETFs can make you feel more positive about a sudden market decline. The best part, of course, is that these will trigger whether or not you happen to be actively monitoring the market.With that in mind, here are a few ETFs, and a GTC "buy" price, that I am thinking about setting in my own portfolio.DIA - $184.29DGRO - $27.21HDV - $74.88ITOT - $48.36IXUS - $47.94VYM - $69.64VWO - $35.15 In each case, the price shown is exactly 89% of today's closing price. Clearly, none of them will trigger unless the asset class they track reaches a point 1% below "correction" level. But, if they do, you're in.If the market suddenly experiences turmoil, wouldn't it be nice to almost be rooting for this to happen, as you get ready to pounce?