BIG SPOILER ALERT!!
I have listed every free shop purchase that William has made until now in the story.
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In The 2 year time skip he had 24 chances for free purchases:
- 3 X binders for Max, Leila and Sera
- Infinite Chocolate Machine[1]
- Domain of infinite [2]
- Heaven Sundering Divine Sword Art[3]
- Bio-mech transformation orb[4]
- Trickster's veil[5]
- Fusion Core[6]
- primordial god flow scripture[7]
- Array hijacking stamp[8]
- Armament Nexus[9]
....12/24 have been mentioned, the list will be updated with the story.
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Other free purchases outside the 2 year time skip.
1. Infinite storage.[10]
2. Crimson Aeon (sword) [11]
3. Binder for Katherine.[12]
[1] ch 11
[2] ch 24
[3] ch 24
[4] ch 32
[5] ch 43
[6] ch 47
[7] ch 47
[8] Ch 65
[9] ch 94
[10] ch5
[11] purchases in ch 18,19 /n mentioned in ch26
[12] around ch 54