UPDATE: Need an RSPB Shop account to use code.
UPDATE 2: I think min spend is now £5.01. No longer works for baskets totalling £5.
Just had this in my inbox. Sign up and you'll get a bunch of fact sheets, calendar and sheet to mark off any birds you spot in your garden.
Plus you'll get a voucher for £5 off and FREE delivery at the RSPB shop. I've just tested the voucher on items that are £5 and it takes that off. So there are some free things to be had.
However, I'd feel bad for not letting such a great charity have some money. :)