There is no way around the iCloud lock -- It could be stolen or the owner never completely reset the iPad. I would suggest that you contact the seller and let them know that you would like a refund if they are not going to provide you with the information to have it unlocked. The iCloud lock is a security precaution and it cannot be bypassed without the actual password. I would remind the seller that you will dispute the sale and leave negative feedback which should make the seller try to resolve the issue.
That is difficult because the seller is not obligated to reimburse you for out of pocket expenses even though it was because you were trying to fix his mistake. The only thing that you can do is to let them know that you would leave negative feedback but they are not obligated or required to refund the $120 that you spend out of pocket. What I would suggest that you do is, take the refund from the eBay seller and contact your bank to dispute the $120 that you spent with the company since it did not work or you can contact that company to ask for a refund.
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