We discovered the iConsumer shopping portal that is offering 8% back on eBay; they then added a limit of $20 per month, or $250 in purchases per month.
They now raised the amount to $80 per month, or $1,000 in eBay purchases that can earn 8% cashback. Update: Now I’m seeing $20 again. Wow, that was fast.
Presumably, this resets at the beginning of each calendar month; we reached out to them to verify this point.
Here is Will’s referral link for iConsumer