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Hawkeye Graphic Novel Sale at Comixology $1.99
Most of these are at all time low prices as well.
I strongly recommend the following runs:
Matt Fraction and David Aja's run on Hawkeye is the gold standard (IMO) - Vol.1 is also only .99! All four volume is definetly worth the $7 - https://www.comixology.com/Hawkeye-Vol-1-My-Life-As-A-Weapon/digital-comic/42112?ref=YnJvd3NlL3NhbGUvZGVza3RvcC9ncmlkTGlzdC8zOTI5NQ
Old Man Hawkeye - Pick up both volumes for only $3 - https://www.comixology.
Tales of Suspense: Hawkeye & The Winter Soldier - https://www.comixology.
Hawkeye: Kate Bishop is another fun one - Vol. 1 is only .99 as well. - https://www.comixology.com/Hawkeye-Kate-Bishop-Vol-1-Anchor-Points/digital-comic/494889?ref=YnJvd3NlL3NhbGUvZGVza3RvcC9ncmlkTGlzdC8zOTI5NQ
Young Avengers with Kieron Gillion is great and all 15 issues (3 Vol.) will only cost you 5$ total! - https://www.comixology.com/Young-Avengers-Vol-1-Style-Substance/digital-comic/55319?ref=Y29taWMvdmlldy9kZXNrdG9wL3NsaWRlckxpc3Qvc2VyaWVz