Amazon are celebrating Thor Day with 3 free Thor comics. Note you will see the price but after buying it the order will be for 0.00. Please ensure the banner still mentions the free comic otherwise it has expired.
Thor Vol. 1 by J. Michael Straczynski
Thor Thunder of God Vol. 1 by Jason Aaron
UPDATE I had an issue with Thor Visionaries Vol 3 looks like for others it is ok. Must've drawn the short straw. Anyway awaiting Comixology about this :(.
Thor Visionaries Vol 3 By Walt Simonson
Also there is another Marvel sale if you missed out a month back. Check it out here
Don't forget 6% cashrewards.