It really depends if it in redemption period or "pending delete"
You can try out: DNMeter, but you would need to know the exact date it drops - means it would have to be in pending delete for it's "status". If so, DNMeter would provide an approximate drop time for your dropping domain.
Otherwise, check out the dropping lists like at: Snapnames, Namejet & pool. To try & judge drop time of the domain. you want
Goodluck in your drop catching.