Have you checked out the Aixis modules on ebay? Daguin did a full review here recently. I have two and they both put out upwards of 80mW without any tweaking - they are still listed ready to sell at around 38GBP or 76-ish dollars U.S.
Snoctony does a very similar module on ebay every so often on a three day auction. I have had two of these recently delivered but have yet to run a full comparitive test. These were a little over 20GBP each - 40something dollars U.S.
Regards, Doc Z.