Well, in terms of pricing anything is possible. However, you are talking about flying in only a few months, during one of the busiest Trans-Atlantic seasons of the year. If the planes are filling up then Delta won't drop prices, but there's always the chance of a last-minute fare reduction sale. I've seen those happen fairly often and I've even taken advantage of a LHR sale myself.

I just looked at fares and MCI is your best bet, either to DUB or SNN (as of today).

Right now, all TATL flights are high priced, but have the possibility of going down.

HOWEVER, for what its worth, the lowest nonstop on Delta I could find to DUB was direct out of JFK ($1064), and direct out of JFK for SNN as well (969). If you can snag yourself a low cost carrier to New York and get to JFK that might save you some cash.

Other options: fly another airline, use a travel agency who has contracts (Cook Travel for example) use miles, or pay with miles (if you have the credit card).