Lowes - Any Price Guarantee seeing how BF is coming up?

I"m thinking of buying a GSW hot water tank ($999) with the 15% off sale this week. However, with BF coming up the tank might be on further discount. Wondering does LOWE's have a price guarantee if they lower it on BF sales? I don't want to miss out on the 15%. If they do what's the day limit? Within 15 or 30 days?

Thanks for any info as i can't seem to find it on their website :/