even if I have to use my entire credit card, which I did

[Aikuzo]

- Whenever he releases a product, I always buy it no matter what. (even if I have to use my entire credit card, which I did)

Should there be a comma there? Because it's kind of like "even if I have to use my entire credit card, which I did use my entire credit card."
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I quit studying English years ago and have just come back to study the basics.

[Mister Micawber]

Yes, but the parenthetical remark should be incorporated with the rest of the statement.
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Native English teacher at Mister Micawber's

[Cerberus™]

You could do it like this:
- Whenever he releases a product, I always buy it, no matter what - even if I have to use my entire credit card, which I did.