The T1 spades on my Analysis Plus cables are the most robust I've seen. These are milled out of a solid block of copper and then silver plated. Big, but wonderful.
Cardas makes a super spade lug which is made of rhodium and silver which sounds great. They have several grades I am sure they make something that would fit your needs as long as you have deep pockets. Good luck with it.
If you are looking for plain old copper spades, almost any electronics shop will have them and they will probably cost only $3.00 to $5.00 for the 100.
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