Split bolt connectors could very well be your next best choice. They are common here.
The only thing to watch for is the UL rating. Split bolt connectors (all-purpose type) are only UL rated for copper and copperweld wires only. but they are advertised for any combination of two dissimilar metals. Most vendors don't know this. One to look for will be dual-rated APS series (NSI), made from tin-plated aluminum. UL (486B) listed for aluminum and copper condutor combinations. The other thing to look out for is a good sealer to avoid moisture, and a very good connection.
