Hello

A definitely NO !!

See if seller will allow you to retract your bid & very unlikely & not obliged either !!  eBay is not a game & waisting a seller's time & effort is not coll either

You cannot cancel your bid because you have found another one cheaper as unacceptable in the least !!

You entered a bidding contract when you bided for item & your reason to cancel the bid is an Invalid one

The time to search is before bidding & not after

So hope that you are out-bid & if not then you will have to pay for item as simple as this

Also seller will report you for invalid bid retraction & this will be noted on your account  as there are only 3 reasons to retract a bid & this one is definitely not one

I bid I win I pay you deliver as the motto goes