This can be a good offer if you buy Avios points and use them strategically - for upgrades or to pay for flights on routes where there flights cost a defined number of Avios points to book. See here
Get offer at: https://www.avios.com/ie/en/collect/buy-and-gift (tip - user name name and password are same as your Aer Lingus ones).
Aer Lingus/ Avios speil
Dreaming of golden sands and crystal clear waters? Top up the piggy bank now so you can turn your travel dreams into reality later.
And there’s good news: we’ll give you 50% Bonus Avios when you buy Avios for yourself or as a gift for someone else before 14 August 2020*. You can buy up to 200,000 Avios, and get up to 100,000 Bonus Avios on top.
Don’t forget, your Avios don’t expire as long as you collect, spend or buy at least one point every 36 months, so you have the flexibility to use them when you’re ready.