Can someone give me a link for a weaver compatible scope mount that will work on the JG G3? (T3 K1). It has to be from Amazon and under $20. Thanks in advance 
Here are a few links to mounts on amazon. H&K designed the G3 and MP5 similarly, so mounts for both guns are the same.
This one is a low profile mount for your G3. If you are planning on mounting a scope it might be too low on the gun even with high scope mount rings, but if you detach the front sight you should be fine. (If it can be taken off that is...)
http://www.amazon.com/NcSTAR-MP5-Scope-Mount-MDMP5/dp/B000KELQQS/ref=sr_1_2?ie=UTF8&s=sporting-goods&qid=1251257514&sr=8-2
This one should rise a tad more and will work well with a scope and high scope rings.(You will probably be just fine with standard height scope rings.) Plus you get an extra rail on the side for extra accessories. Just a tad over 20 bucks.
http://www.amazon.com/Leapers-Claw-Mount-MP5-variants/dp/B0016NCQCA/ref=sr_1_15?ie=UTF8&s=sporting-goods&qid=1251257514&sr=8-15
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