In two proper games (both on monarch) and a test game (opponents chosen, map rerolled until starting positions as I wanted them) the following strategy has worked pretty well for me:
If you have an opponent that is wonder happy (industrious or a builder AI), gift them the relevant tech and if you have it, also gift a relevant resource (marble or stone), they then seem to be quite happy to build the wonder for you. I did this with stone and marble for Peter in one game and marble/literature for Huyana Capac in another. Peter built parthenon/hanging gardens and, importantly, Pyramids, whereas Huyana Capac put up the Great Library and the Parthenon.
While they were building these multi-hundred hammer wonders, I was building axes, spears and swords. Soon they were MY wonders
Of course, this strategy has a fatal flaw in that there might very well be other AIs building the same wonders etc. so its nowhere near a 100% surefire winner.
However, I think its the case that the AI will not trade techs that allow access to a certain wonder while they are building that particular wonder. Therefore, if one manages to gain exclusive early access to a tech which allows a certain wonder (literature comes to mind, perhaps also democracy fo SoL..) and then gifts the tech to an AI, will they avoid trading it further?
If this is the case and one has an industrious builder neighbor, wonders should be free and plentiful by making sure they have access to the correct resource and tech. In the meanwhile the player can keep up conquest without pause..
If you have an opponent that is wonder happy (industrious or a builder AI), gift them the relevant tech and if you have it, also gift a relevant resource (marble or stone), they then seem to be quite happy to build the wonder for you. I did this with stone and marble for Peter in one game and marble/literature for Huyana Capac in another. Peter built parthenon/hanging gardens and, importantly, Pyramids, whereas Huyana Capac put up the Great Library and the Parthenon.
While they were building these multi-hundred hammer wonders, I was building axes, spears and swords. Soon they were MY wonders

Of course, this strategy has a fatal flaw in that there might very well be other AIs building the same wonders etc. so its nowhere near a 100% surefire winner.
However, I think its the case that the AI will not trade techs that allow access to a certain wonder while they are building that particular wonder. Therefore, if one manages to gain exclusive early access to a tech which allows a certain wonder (literature comes to mind, perhaps also democracy fo SoL..) and then gifts the tech to an AI, will they avoid trading it further?
If this is the case and one has an industrious builder neighbor, wonders should be free and plentiful by making sure they have access to the correct resource and tech. In the meanwhile the player can keep up conquest without pause..