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EQ6 or CGEM are really your only 'cheap' options if you plan on long focal lengths later on.
Both can be made to work really well. Consider it a one off investment, there will be no point buying a cheaper mount if photography is in your future.
Buy 2nd hand from someone known here if you can, then you can get some history on the mount, and some PE graphs to know what you are getting. You will usually end up scoring some much needed accessories as well.
Also then, if you don't like it, you can re-sell it for pretty much what you paid for it, if buying new you will take a big hit on resale...
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