Limited-time only: Earn up to double Avios — or more — on British Airways eStore purchases

For a limited-time only, British Airways is offering up to double Avios — and sometimes more — on purchases at some retailers through its online shopping portal, the eStore.

To be eligible, you must be a member of the British Airways Executive Club. The offer for up to double Avios — and sometimes more — ends 8 March. To take advantage, head to the eStore, where you will be asked to sign in using your BA Executive Club membership number. Once in the portal, make sure all purchases are made directly through the page that opens after clicking on the retailer of your choice.

Aside from signing up for a credit card and receiving a chunk of points or earning Avios through flying, shopping portals are some of the best and easiest ways to rack up points fast. For example, with the bonus on Macy's purchases — 7 Avios per dollar spent — a $1,000 purchase would net you 7,000 Avios, which are worth $105 based on TPG's most recent valuations.

Some of the best offers include: Kiehl's (12 Avios/$1 — up from 8), Godiva (10 Avios/$1 — up from 5), Ray Ban (10 Avios/$1 — up from 7), Bloomingdales (7 Avios/$1 — up from 2), Tory Burch (5 Avios/$1 — up from 2), and more.

Terms and conditions state that if items are cancelled or returned, Avios will not be awarded. The offer applies to participating retailers only — be sure to check before you buy.

Additional reporting by Emily McNutt.