If you missed out on the freebie deal, then you can buy 3 for the price of 2 at boots.com Make sure you add 3 to your basket otherwise you won't get the free one. (I looked on ebay at the completed listings and someone bought just one for £15 and £2.50 P&P!! The rest are selling for around £10 each so you're basically saving a tenner and cheaper P&P)
You get 3.5% Quidco, can pay by paypal so great if you've got money left over. You can get free P&P if you spend over £40, and if you have an advantage card it's 4 points per £1 spent, so you could get 19 points too. Also, I just looked for some vouchers, if you spend £60 you get 600 advantage card points so basically £6 back.
With the 3 for 2, you don't have to buy all Garnier eye roll on, you could buy bio oil, Dr Lowe, there's over 1000 facial & skincare products so it's upto you.