For anyone who uses the Gixen Sniping service, they are getting ready to raise their annual subscription fees. But if you lock into a recurring payment plan now, you can lock in a rate of $6 / year in perpetuity. You can use Gixen for free but paying for the subscription gets you unlimited numbers of snipes and you also get your snipe submitted from a backup server which pretty much guarantees your snipe will go through.
https://www.gixen.comAnd no, I am not affiliated with Gixen at all. But I have had some real good success using it and I think it well worth $6 a year.