Dealing with auctions ending at a bad time?

[AJLareneg]

What methods do you guys use to deal with auctions that end when you literally won't have access to the internet?

Like an auction that ends when one is going to be at work, for example?

I tried one of those auction sniping things but it did not work, did not notify me it did not work, and only after the auction was over (I would have won, btw) did it tell me that the auction sniping website had been blocked by the seller (!?!)

What things would you recommend? Or is there a way to check if the auction sniper is banned before you rely on it to make a bid? :\